Well

Water Well Trap
There are several Well types found throughout Necropolis: Dry, Healing, and Trapped. Water from a trapped well is poisonous, causing damage to the player if touched.

Well Traps are guarded by Hydras, a unique breed of Monster that inhabits Necropolis.

Hydras will ambush any player character that approaches the well, swinging its head from left to right dealing dealing approximately 40* points of health as physical damage? (Might be cold/water)

It cannot be killed or damaged.

Note: There is currently a bug, going to the well directly after the Hydra went back in causes it to stay inside.
 * The damage amount was tested as a Blackguard with base Armor and no Blessing of the Gods.