Mabinogi (network game)
Encyclopedia
Mabinogi is a massively multiplayer online role-playing game
Massively multiplayer online role-playing game
Massively multiplayer online role-playing game is a genre of role-playing video games in which a very large number of players interact with one another within a virtual game world....

 released by South Korean Game Distributing Company Nexon
Nexon Corporation
Nexon Co. Ltd. is a South Korean video game developer and publisher of online games and MMORPGs. Founded in Seoul in 1994, Nexon's headquarters is currently based in Tokyo. Nexon provides over 30 games which are serviced in 72 countries globally, reaching 1.14 billion players...

, and developed by devCAT studio. Although the name of the game is taken from a Welsh
Welsh language
Welsh is a member of the Brythonic branch of the Celtic languages spoken natively in Wales, by some along the Welsh border in England, and in Y Wladfa...

 anthology of legend
Mabinogion
The Mabinogion is the title given to a collection of eleven prose stories collated from medieval Welsh manuscripts. The tales draw on pre-Christian Celtic mythology, international folktale motifs, and early medieval historical traditions...

, the settings for the game are loosely based on Irish mythology
Irish mythology
The mythology of pre-Christian Ireland did not entirely survive the conversion to Christianity, but much of it was preserved, shorn of its religious meanings, in medieval Irish literature, which represents the most extensive and best preserved of all the branch and the Historical Cycle. There are...

.

The game engine features hand-painted textures stylized with edge detection outlining. The game world is developed continuously, through the release of important patches
Patch (computing)
A patch is a piece of software designed to fix problems with, or update a computer program or its supporting data. This includes fixing security vulnerabilities and other bugs, and improving the usability or performance...

 (referred to as "Generations" and "Seasons") that introduce new areas, additional features such as pets and new skills, and advancement of the storyline. The user interface
Graphical user interface
In computing, a graphical user interface is a type of user interface that allows users to interact with electronic devices with images rather than text commands. GUIs can be used in computers, hand-held devices such as MP3 players, portable media players or gaming devices, household appliances and...

 is simple and designed in the likeness of Microsoft Windows
Microsoft Windows
Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...

' task bar.

Mabinogi was built on a hybrid Value Added Services model (which varies slightly for each game localization) that allows free play and the subscription of paid packages, purchased through the game shop. In South Korea, beginning with the Chapter 3 patch, Mabinogi changed to micro-transactions. It now allows 24-hour free play and the Item Shop only offers items and subscriptions for added options.

The game service is currently available in South Korea
South Korea
The Republic of Korea , , is a sovereign state in East Asia, located on the southern portion of the Korean Peninsula. It is neighbored by the People's Republic of China to the west, Japan to the east, North Korea to the north, and the East China Sea and Republic of China to the south...

, Japan
Japan
Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

, Taiwan
Taiwan
Taiwan , also known, especially in the past, as Formosa , is the largest island of the same-named island group of East Asia in the western Pacific Ocean and located off the southeastern coast of mainland China. The island forms over 99% of the current territory of the Republic of China following...

, Hong Kong
Hong Kong
Hong Kong is one of two Special Administrative Regions of the People's Republic of China , the other being Macau. A city-state situated on China's south coast and enclosed by the Pearl River Delta and South China Sea, it is renowned for its expansive skyline and deep natural harbour...

, Mainland China
Mainland China
Mainland China, the Chinese mainland or simply the mainland, is a geopolitical term that refers to the area under the jurisdiction of the People's Republic of China . According to the Taipei-based Mainland Affairs Council, the term excludes the PRC Special Administrative Regions of Hong Kong and...

, North America
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

, Oceania
Oceania
Oceania is a region centered on the islands of the tropical Pacific Ocean. Conceptions of what constitutes Oceania range from the coral atolls and volcanic islands of the South Pacific to the entire insular region between Asia and the Americas, including Australasia and the Malay Archipelago...

, Europe
Europe
Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...

, Israel
Israel
The State of Israel is a parliamentary republic located in the Middle East, along the eastern shore of the Mediterranean Sea...

, and most recently, Turkey
Turkey
Turkey , known officially as the Republic of Turkey , is a Eurasian country located in Western Asia and in East Thrace in Southeastern Europe...

 & Russia
Russia
Russia or , officially known as both Russia and the Russian Federation , is a country in northern Eurasia. It is a federal semi-presidential republic, comprising 83 federal subjects...

.

The North American closed beta test began on January 30, 2008, at 2pm PST. The pre-open beta only available to Fileplanet users was released on March 5, 2008. The full open beta was released on March 6, 2008, at 3PM PST. The North American localization of Mabinogi was officially released on March 27, 2008.

During the 2007 Gstar game show in Seoul, South Korea, Nexon announced an Xbox 360 version of Mabinogi. However, in September 2009, they had announced that, even though the development was finished, the release of the console version has been indefinitely suspended after evaluations of the game through their business decisions.

Gameplay

The player is not limited by any class other than the character's race, and is free to level up any of the different skills available. The combination of skill choices, age, items, physical constitution, and other variables such as user titles, is what makes up the character. The gameplay is largely skill-based. To learn and improve skills, Ability Points (AP) are required.

There are also various social aspects, like sitting around a campfire, playing music, having a friendly chat, sharing food, as well as making use of different facial expressions to make user interaction more colorful.

There are currently two continents, Uladh and Iria. If the player decides to start as a human, he or she will begin their game in the Uladh village of Tir Chonaill. If the player chooses to be an elf, the game begins in Iria at Filia, in the region Connous. Should the player decide to start as a Giant, they will begin their game at Vales, in the region Physis, which is located far north in the continent of Iria. As of the Generation 13 patch, a realm outside of Erinn, Avon (based on Stratford-upon-Avon
Stratford-upon-Avon
Stratford-upon-Avon is a market town and civil parish in south Warwickshire, England. It lies on the River Avon, south east of Birmingham and south west of Warwick. It is the largest and most populous town of the District of Stratford-on-Avon, which uses the term "on" to indicate that it covers...

), is able to be accessed by an item found in the first mainstream quest of that generation.

Character creation and development

Characters are created by using Character Cards. One card (called a free card) is given free of charge when there are no characters in the account (such as when an account is newly created). There are two kinds of cards that can be bought: basic and premium. Basic cards costs less, but can not use premium features. Premium cards allow more customization options, such as lips, eyes, hair, and colors, but are not required.

Currently there are three races: human, elf and giant. When creating a character, one may choose an age between ten and seventeen. The character will age one year every (real) week. Different ages yield different initial stats and affect the amount of stats raised when leveling up. AP (Ability Points) are also granted when aging; the younger one is, the more AP they will get when they age.

Rebirth is an important feature in Mabinogi. Rebirth allows the player to change the character's age, gender, appearance, and reset the character's level back to 1, while keeping all previously learned skills. As of the North American release of "Pioneers of Iria" players may now rebirth for free upon reaching age 20. The free rebirth option allows the player to reset their level and age, but will not allow them to change their character's appearance. Basic and Premium cards are available to players who do not wish to wait for their character to age to 20, but have a one week delay limit from the previous rebirth. Rebirthing by use of a character card will allow the player to change their character's appearance as well as reset age and level.

Each (real world) day of the week grants players specific bonuses, such as getting a higher experience rate for certain skills, higher item creation success rate, aging, gaining AP, etc.

As of the Generation 14 patch, new players who are under level 100 can rebirth for free every day until level 100. Along with free rebirths, the player will be given a free horse that can be used for a week.

Combat system

In combat, predicting the enemy's skills and making use of combat skills is important. Some monsters are aggressive and will attack and pursue on sight (also called "aggroing"), while others attack in a pack or completely ignore the player. Unlike other MMOs, Mabinogi's combat is arguably more tactical in nature - requiring careful analysis and timing of what skills to use and in what fashion. As opposed to the 'tank' roles portrayed in other online games, Mabinogi's combat focuses on the player not being hit at all - through careful use of skills and precise timing. The overall complexity of Mabinogi's combat system has made it much more difficult for training bots
Computer game bot
A bot, most prominently in the first-person shooter types , is a type of weak AI expert system software which for each instance of the program controls a player in deathmatch, team deathmatch and/or cooperative human player. Computer bots may play against other bots and/or human players in unison,...

 to be developed. Many are just designed to farm the significantly easier low-level monsters for in-game currency.

Mabinogi features a traditional melee combat approach (utilizing various swords, maces and shields), a ranged combat approach (using various weapons such as crossbows and long-bows) and a magic or alchemy approach - all of which have their own strengths and advantages at different points of the game. Mabinogi's freeform skill system allows players to hybridize between any four of the combat trees at any time - the only limitation lying with the player's overall proficiency at operating the game controls and mechanics.

Dying causes loss of experience point
Experience point
An experience point is a unit of measurement used in many role-playing games and role-playing video games to quantify a player character's progression through the game...

s, and sometimes equipment (lost items can be retrieved at an NPC at a cost). Fallen players can be revived by other players, or by the in-game NPC, Nao, if the player has bought such service. If the character has zero experience points and suffers a death penalty, negative experience points will accumulate. If the player reaches negative 100% experience, they will no longer be able to revive by themselves and must wait for another player to revive them, or use "Soul stones" purchased from the "Item Mall" (Requires Nexon cash points, currency that can be used to buy special items that cannot be bought in-game. Nexon cash points cost real money.).

Stats

Character statistics alter the combat system by the individual qualities of a character. Statistics are split into five categories: Strength, Intelligence, Dexterity, Will, and Luck. Strength, Intelligence, and Dexterity all determine the base attack power of melee, magic, and ranged, respectively. Dexterity also determines damage balance during melee combat. Will affects how your character absorbs strong blows and how much damage is done to enemies. A character's luck rating may improve the chance of high hits, gathering, and increases the chance of lucky drops.

These statistics may be raised by ranking most skills. For example, Magic Mastery, because its dealing with magic, raises a certain amount of Intelligence per rank. The raising of Life Skills is beneficial to warriors because of Strength increases in activities such as carpentry and fishing. The "Destiny System" released in Generation 13 adds an extra 10 points to Strength, Intelligence, and Dexterity to the Warrior, Mage, and Ranger destinies, respectively.

Fantasy Life

There is a wide range of Life skills which give the player the chance to experience a different side of the “fantasy life”. Players can perform tasks such as tending to the wheat and potato fields, making flour, gathering wool from sheep and eggs from hens, weaving and making garments, mining for minerals and crafting weapons, playing and composing music, cooking dishes, taming animals, etc.

Using a system called Music Markup Language (actually a variation of Music Macro Language
Music Macro Language
Music Macro Language is a music description language used in sequencing music on a number of computer and video game system platforms.MML is also sometimes known as Music Markup Language, by conflation with the XML musical notation markup language of that name...

, which is completely distinct from the notation format usually referred to as Music Markup Language
Music Markup Language
Music Markup Language is an XML application to describe music objects and events, using different modules and markup. MML can be delivered in different formats, such as text, block bars or piano roll, Common Western Notation or MIDI-devices. Since MML can be employed in such simple and accessible...

), players may compose their own arrangements or use music scrolls created by other players. In the North American version, these are known as the "Compose" and "Play Music" skills. Different musical instruments, such as lute
Lute
Lute can refer generally to any plucked string instrument with a neck and a deep round back, or more specifically to an instrument from the family of European lutes....

s, ukulele
Ukulele
The ukulele, ; from ; it is a subset of the guitar family of instruments, generally with four nylon or gut strings or four courses of strings....

s, flute
Flute
The flute is a musical instrument of the woodwind family. Unlike woodwind instruments with reeds, a flute is an aerophone or reedless wind instrument that produces its sound from the flow of air across an opening...

s, and others can be used to play.
NPC
Non-player character
A non-player character , sometimes known as a non-person character or non-playable character, in a game is any fictional character not controlled by a player. In electronic games, this usually means a character controlled by the computer through artificial intelligence...

 interaction is important. As the player talks to different non-player characters, more dialog keywords will become available. These will reveal plot points and NPC backgrounds, unlock quests or skills, etc. NPCs also offer a variety of services such as shops, item repair and upgrade, skill apprenticeships and more. Players can also request part-time jobs from some of the NPCs, which can be completed in a quest-like fashion.

Quests, Exploration Quests and Part-Time Jobs

There are many different quests that players can complete throughout the game. Different types of quests exist, some are party quests, others involve monster hunting, item collecting or other tasks, for instance, skill-based quests like cooking or tailoring.

Some of them are received by the player at specific points or after certain quests are completed, others are given by the NPC
Non-player character
A non-player character , sometimes known as a non-person character or non-playable character, in a game is any fictional character not controlled by a player. In electronic games, this usually means a character controlled by the computer through artificial intelligence...

s, some can be purchased as quest scrolls and, finally, there are also exploration quests that the player can enroll in through the Quest Boards found throughout Erinn.

Quest rewards may consist of experience points, Ability Points, gold, items or a combination of these rewards. Quests help the player to discover the game's regions and to find out about the many available NPCs, as they involve traveling to different parts of the game world and talking to all the different non-player characters.

Exploration quests typically involve finding certain hidden objects using a pair of L-shaped rods or by finding landmarks or animals and making a sketch of these. Different exploration quests are available according to the player's exploration level. There is also a player rank for the completion of each quest. When a character completes exploration quests or simply comes across these hidden landmarks, the character's exploration level will increase, and as they level up, the character will gain Ability Points, and access to new exploration quests.

Another type of special quests are part-time jobs, which are given by the NPCs. Part-time jobs are only available at a specific time of the day for each NPC and have a time limit to be completed. The player must complete the requested tasks (i.e.: delivering an item to another NPC, crafting a certain number of items, collecting objects, doing farming chores, etc.) and report back to the NPC to choose their reward. As the player successfully completes more jobs, NPCs will give more rewarding quests.

Repeating these jobs helps to raise the intimacy level between the player and the NPC (giving certain items to the NPC may also help). When a "friendship" has been established between them, certain merchant NPCs will reveal a secret store to the player with special items to purchase.

Mainstream plots

Mabinogi also has several mainstream story campaigns. These campaigns have connected story lines (when grouped together, are called Chapters) that reveal the background story of Erinn and several important characters. There are campaigns, such as Generations 1 through 3 (Chapter 1), and 9 through 12 (Chapter 3) that must be completed in sequential order, each implemented at their corresponding Generation updates. Currently, most Mabinogi versions are updated to Generation 15.

Skills

Each character can develop a large number of skills, although some can only be learned if the character is of a certain race (Human, Elf, Giant). Skills are divided into four categories: Life, Combat, Magic and Alchemy. Life refers to crafting and performing skills, such as fishing, cooking, composing, tailoring, blacksmithing or potion making. Some of the Life skills available are also mini-games. Combat skills refer to melee and ranged attack skills, as well as defensive moves. Magic comprises three kinds of elemental magic (ice, fire and lightning) and non-elemental magic, such as healing and recovery skills. In Generation 9, Alchemy was introduced to the game world. Alchemy is used with a cylinder and a crystal, and can be used to create temporary walls, summon golems and a number of spells resembling magic (water/ice, fire/fire, wind/lightning and clay/neutral) according to the crystal used.

Skills can improved by advancing them to higher ranks. This is done by meeting certain requirements, usually involving the use of the skill. For most skills, it is also required to spend a number of Ability Points, which are acquired by gaining levels or aging.

Time and weather

The game has its own internal clock, with thirty-six minutes of real time corresponding to one in-game day. The sun and moon move visibly across the sky with the hours, with objects casting shadows that move accordingly, and the moon undergoes phases
Lunar phase
A lunar phase or phase of the moon is the appearance of the illuminated portion of the Moon as seen by an observer, usually on Earth. The lunar phases change cyclically as the Moon orbits the Earth, according to the changing relative positions of the Earth, Moon, and Sun...

. A second moon, always rising and setting opposite the sun, is described as the source of magic energy, and players recharge mana
Mana
Mana is an indigenous Pacific islander concept of an impersonal force or quality that resides in people, animals, and inanimate objects. The word is a cognate in many Oceanic languages, including Melanesian, Polynesian, and Micronesian....

 faster while it is in the sky.

In Erinn, the Sun is called Palala, it is said to provide energy on the world. The Red Moon is called Eweca, which generates Mana. The Blue Moon is called Ladeca.

Each real time day of the week offers players the opportunity to take advantage of specific gameplay bonuses, such as increased skill success or lowered NPC store prices and also go to the other world. Weekday names used in-game reflect the Celtic mythology that the game evokes. In Mabinogi, actual days of the week represent seasons and are named for the traditional Welsh and Irish quarter days
Quarter days
In British and Irish tradition, the quarter days were the four dates in each year on which servants were hired, and rents were due. They fell on four religious festivals roughly three months apart and close to the two solstices and two equinoxes....

 and cross-quarter days.
  • Imbolic (Sunday)
  • Alban Eiler
    Equinox
    An equinox occurs twice a year, when the tilt of the Earth's axis is inclined neither away from nor towards the Sun, the center of the Sun being in the same plane as the Earth's equator...

    (Monday)
  • Beltane
    Beltane
    Beltane or Beltaine is the anglicised spelling of Old Irish  Beltaine or Beltine , the Gaelic name for either the month of May or the festival that takes place on the first day of May.Bealtaine was historically a Gaelic festival celebrated in Ireland, Scotland and the Isle of Man.Bealtaine...

    (Tuesday)
  • Alban Heruin
    Solstice
    A solstice is an astronomical event that happens twice each year when the Sun's apparent position in the sky, as viewed from Earth, reaches its northernmost or southernmost extremes...

    (Wednesday)
  • Lughnasadh
    Lughnasadh
    Lughnasadh is a traditional Gaelic holiday celebrated on 1 August. It is in origin a harvest festival, corresponding to the Welsh Calan Awst and the English Lammas.-Name:...

    (Thursday)
  • Alban Elved
    Equinox
    An equinox occurs twice a year, when the tilt of the Earth's axis is inclined neither away from nor towards the Sun, the center of the Sun being in the same plane as the Earth's equator...

    (Friday)
  • Samhain
    Samhain
    Samhain is a Gaelic harvest festival held on October 31–November 1. It was linked to festivals held around the same time in other Celtic cultures, and was popularised as the "Celtic New Year" from the late 19th century, following Sir John Rhys and Sir James Frazer...

    (Saturday)


A dynamic weather system is also in place, with effects such as heavier or lighter cloud cover, rain, and thunder. The weather affects the outcomes of certain player skills and work done by NPCs.

Dungeons

Mabinogi uses an instanced dungeon system, with random map generation, that allows dungeon exploration by multiple players at the same time. When a player enters a dungeon, he will find a lobby with a statue of the goddess, and a platform before it. A separate dungeon instance is created for every unique type of item thrown on the platform (for dungeon passes, a unique instance is created for each instance of pass dropped). Depending on what the player drops, he might end up in a dungeon instance with players already in it.

Dungeons maps consist of connecting rooms and corridors. As the player explores the map, the player will encounter chests or other devices which will, if opened or activated, summon monsters that must be defeated in order to progress in the dungeon path. At the end of each dungeon, there is a large room, which will usually have the boss enemy of the dungeon (sometimes escorted by a number of other enemies). Once the boss and its minions are defeated, a treasury room is opened, with the rewards for clearing the dungeon. The number of treasure chests inside the treasury will be equal to the number of characters in the dungeon (at the time of dungeon creation). Players can thus explore the dungeons in teams. Some dungeons have special items called passes which allow harder (and sometimes easier) versions to be done. Some passes require a specific number of players to form the team.

After Generation 9, similar dungeons called Shadow Missions and Theatre Missions were implemented. They feature the same basic mechanics, but are selectable by the player and usually take place on a large, isolated, fixed map or area instead of using a generated map.

Titles

Achieving certain conditions (collecting items, performing tasks, etc.) will reward the character with a title. These conditions can range from participating in the closed beta to completing quests. Titles, when applied to a character, can positively or negatively change the character's stats. Titles can also be applied to pets, though they have no effect on their stats.

Some titles are unique in the server, with each server having only one character who holds that specific title.

Achievements

Players can also acquire achievements, which are recorded by an achievement journal, by doing numerous events like acquiring a title or completing a dungeon.

Destiny System

In Generation 13, a feature called "Destiny System" was implemented. Similar to a class system, but without any penalty or skill limitations, this system allows the player to optionally choose their specialized job and become either a Warrior, Ranger, Mage, Alchemist. Players have the chance to change or choose Destinies during every rebirth.

When players specialize in a Destiny, they gain a specific stat increases to that own Destiny (i.e., Warriors gain more strength than average). In addition, they gain twice the training experience they would normally gain for the said skill (i.e., being a Warrior allows you to train Smash twice as fast), and they will not be penalized in other Destiny skills (i.e., Warriors can train and use all magic skills without limitations).

Other game features

Players can set up stores to sell their items. Items cannot be looted
Looting (gaming)
Looting in a gaming context, specifically in massively multiplayer online games and MUDs, is the process by which a player character obtains items such as in-game currency, spells, equipment, or weapons, often from the corpse of a creature or possibly the corpse of another player in a PVP situation...

 since any item dropped from a monster cannot, as a rule, be picked up by another player for an amount of time proportional to an item's value. Items can be safely traded through the trading panels. As another safeguard to item loss, items dropped by a player as a result of the player's death are automatically recovered by an NPC nearby, where they can be retrieved.

Generation 3, in later updates, added housing areas between Tir Chonaill and Dunbarton in an area splitting off of Dugald Aisle, and also between Bangor and Emain Macha in an area splitting off of Sen Mag Plateau. Through this housing system, players can bid for a house and pay rent for it afterwards, in order to keep it. Houses may be used as stores, and players are able to purchase items to decorate their homes.

Player characters can also get married in-game, by requesting this to a marriage NPC. A pet system is also available. Players may purchase Pet Cards from the game store and summon them in-game. Pets can help in combat or, in some cases, even be used as transportation, allowing the player to travel at a greater speed than on foot. Each pet has a fully customizable AI system, allowing the owner to give it preset actions he or she desires. Pets can even be played by players themselves. Like the player characters, pets also grow as they age. However, unlike player characters, pets automatically learn skills based on their level.

Other features include the guild, party, and Player vs Player systems. Guild creation requires the purchase of an extended play package from the game store. Guilds can expand/level up by meeting an increasing quota of points (called Guild Points, or GP), which are earned by the guild's members by playing in-game. Similar to other games, the party system allows sharing of experience points between players. PvP
Player versus player
Player versus player, or PvP, is a type of multiplayer interactive conflict within a game between two or more live participants. This is in contrast to games where players compete against computer controlled opponents, which is correspondingly referred to as player versus environment...

 combat is possible in special arenas, as well as between Paladins and Dark Knights at any location, as well as "duels", where characters arrange combat for each other, or their pets. As of the Pioneers of Iria release, elves and giants can also engage in full PvP combat at any location, as well as those humans aligned with elves or giants.

European release

On the 27th of January 2010, Nexon launched the Open Beta of Mabinogi Europe with two game servers: Morrighan and Macha. Along with the Open Beta release came the generation 2 expansion. It was expected that generation 3 would be released when the game enters the official phase, which will be accompanied by the opening of the cash shop. Nexon Europe eventually launched Mabinogi on May 26, 2010. A few months later, Nexon Europe released Generation 12 at the same time as North America on October 2010, a large update featuring new mainstream quests and skills. Shortly after this, Nexon Europe removed 2 of the 5 available game channels in Macha, due to a lack of players in that server.

Franchise

Vindictus, which has a storyline setting that is a prequel to Mabinogi, is currently released in Korea and released in North America through Nexon.

Mabinogi II, the sequel to the original Mabinogi, is also currently in development. It is noted to feature more realistic 3D models, animation and settings, according to development diaries and press releases made by the game developer devCat. The beta was expected to be released in Q1 of 2011.

Controversy

On January 28, 2008, it was reported that a 16-year-old boy from Japan hacked the website of Nexon Japan and accrued 36 million yen (325,000 USD) worth of game points used in Mabinogi. It sparked discussions among the public about the security of an online game's billing system.

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
x
OK