Penumbra Kavu (5e Creature)
From D&D Wiki
huge beast, true neutral
Respawn. When this creatures HP is reduced to 0 it automatically comes back to life after 1D6 days as a corrupted version of itself it loses its resistance to acid damage but gains and Immunity to fire damage and regeneration 5 it's alignment also changes from True neutral to chaotic evil.
Description. This massive reptilian creature is not a dinosaur, dragon or crocodilian the strange mixture of all three possibly the original ancestor of all of them. The specific Kavu is a very ancient breed known to be older than any dinosaur breed and older than most of the existing dragon breeds. This specific Kavu is covered in thick green scales with massive teeth and Tri hooved toes. The penumbra averages 14ft in height and around 6.8tons in weight making it a danger to even the largest herbivores they commonly feed on sauropod dinosaurs like the Brontosaurus and Diplodocus. A unique trait of this kavu alone is its extreme hatred of elves this creature will go miles out of its way to attack an Elven settlement or even to attack a singular elf. On the flip side of this it seems to enjoy the company Of Orcs and goblins often protecting them and their allies when they are in danger.
bite. Natural Weapon Attack: +4 to hit, reach 10 ft., one target. (3d10+7) piercing damage.