The Human Hydra

The remaining guards of the fortress. They tried to save themselves with an act of love.

Description & location
The Human Hydra is a special-encounter only available in the Catacombs: the location may vary, due to the fact that the maps are randomized and unique. The Human Hydra is aggressive towards the player, and demands to be fed human meat. You can either feed it with The Girl or with The Demon Child, but complying with its demands gives no rewards however and refusing its demands has no repercussions.

Strategy
Fighting the Human Hydra has no benefit and reaps no loot, therefore making fighting it unnecessary unless you are simply interested in the encounter for its uniqueness. However, it could allow a character to reap benefits of items like the Sorceror's Stone with minimal risk.

If you begin a fight, the Human Hydra lacks any kind of ability and cannot retaliate at all. You can cut off several of its heads while The Hydra asks you to stop and insults you with basic curse-words.

The lesson one can gleam from this is that to never just give anything to an unknown being just because it asked for something. The player does not know what return value they will get out of the gift they have just given. Like how fighting most of the monsters are a waste of time and with little benefit (there are no mechanics involving experience points or similar things), this too is also a waste of time and of no benefit.