Hidra

Level	120
Health	2.653.838
Experience	104.702
Damage	153 - 285
Defence	210
Behaviour	Aggressive: attacks on sight
Element	Ice
Resistances	Sword +40% · Two-handed +45% · Dagger +35% · Bell +45% · Fan +25% · Bow +25%

Where it spawns

It is not in any map spawn table: it comes from a quest, an event or is summoned by another monster.