Seps (legendary creature)
Encyclopedia
Seps is a snake from Medieval bestiaries
Bestiary
A bestiary, or Bestiarum vocabulum is a compendium of beasts. Bestiaries were made popular in the Middle Ages in illustrated volumes that described various animals, birds and even rocks. The natural history and illustration of each beast was usually accompanied by a moral lesson...

. They had extremely corrosive venom that liquified their prey. Shelley in Prometheus Unbound writes:
...all my being,
Like him whom the Numidian seps did thaw
Into a dew with poison, is dissolved...
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