The abovementioned name is that of a giant slime that can be sacrificed to, it is mentioned nowhere what can be sacrificed, only 'corpse points'.
I have attempted to give it many different kind of corpses, rat meat, rothe meat, worm meat, PC corpse that was found in the low road (And the player offline, most likely because it was a Goblin.) and the type of goblin corpse used in summoning.
Out of all these corpses, it only accepts the rat meat as a sacrifice.
I do not have any screenshots to back this up, however it is true.
Only rat meat is scripted, I'm afraid. Feel free to RP other things though!