The necessitative mood is a grammatical mood

Grammatical mood

In linguistics, grammatical mood is a grammatical feature of verbs, used to signal modality. That is, it is the use of verbal inflections that allow speakers to express their attitude toward what they are saying...

 found in languages such as Armenian

Armenian language

The Armenian language is an Indo-European language spoken by the Armenian people. It is the official language of the Republic of Armenia as well as in the region of Nagorno-Karabakh. The language is also widely spoken by Armenian communities in the Armenian diaspora...

 and Turkish

Turkish language

Turkish is a language spoken as a native language by over 83 million people worldwide, making it the most commonly spoken of the Turkic languages. Its speakers are located predominantly in Turkey and Northern Cyprus with smaller groups in Iraq, Greece, Bulgaria, the Republic of Macedonia, Kosovo,...

, which combines elements of both the cohortative (which is typically used in only the first person) and the jussive moods (which is typically only used in the second and third persons). It expresses plea, insistence, imploring, self-encouragement, wish, desire, intent, command, purpose or consequence.

Examples of the necessitative:

Turkish: Bakmalıyım (I must look); bakmamalısınız (you (pl). should not look); gitmeliyiz (we have to go/we need to go)

Armenian (Eastern): պիտի խոսեմ /piti xosem/ (I have to speak); պիտի խոսեք /piti xosek῾/ (you (pl.) should speak); պիտի կարդանք /piti kardank῾/ (we must read / let's read)