Black jelly

 is a mob drop, gained by defeating a black slime, found only within the deeper levels of the dungeon. It's only known use is being a product for death-related reagents, used in alchemy.

Alchemy
can be decomposed into a solution and extract with the hand mixer and any of the distillation cubes, respectively. Having unlocked Master of Alchemy produces one additional reagent at any workstation.

Чёрное желе