Vampire squid

Vampire squid were a species of large aquatic predators.

Description
Vampire squids were large squid, growing up to in length. Instead of a beak, they had a large mouth filled with razor-sharp teeth. The end of its body was covered in a hard shell.

Abilities
Vampire squids had excellent vision, capable of seeing a target up to away through pitch-black water. They were proficient swimmers, and had the ability to swim rapidly in short bursts.

Combat
Since its tentacles were not strong enough to constrict its prey, a vampire squid used them to wrap a target and drag it in reach of its mouth. Vampire squids would ambush predators. To defend itself, a vampire squid inverts its mouth, exposing its sharp teeth. Its mouth was large enough to envelope most of its body, giving it a natural armor covered in its teeth.

Ecology
Vampire squids were not natural, instead they were created by mind flayers. Their purpose was to serve, extending the influence of their masters to the underwater domains of the Underdark.

Vampire squid were voracious carnivores, eating several hundred pounds of fish, insects and shellfish per day. They were solitary creatures for this reason, as two or more vampire squid inhabiting the same body of water would consume all the prey in a matter of weeks. The only time they gathered was to either mate or were summoned by a mind flayer.