Hi, I'm psychological [Lvl 19] and i need tips and tricks on how to kill the hydra. I just can't seem to kill it, one of the heads hit me for 2400+ Damage for some reason.
The 2 little heads have a weakness to shadow and ice. You should be able to kill them with 1-2 Attacks (Dark Injection worked fine for me, did 5k crits even though I was electro specced) and then concentrate on the big head.
After that, there shouldn't be any problems killing the Hydra.
If you still can't manage to beat it, level up to 20/21, that should be more than enough.