Diablo 1 HD Hellfire Mod | Awake

This guy always spawns on Izurath's Lair (Hell) with immunity to everything and too much HP to spam apocalypse/meteor. I try a -15% lighting res. staff and not even a scratch. Should I give up casting and go melee/tele him to a corner?

There exist staffs with up to -30 elemental resists. maybe u need one of those.

Furthermore you should use your elemental resistance lowering skill in combination with such staffs and try every element. If it does not work and you cannot hurt the enemy with apo/meteor by large amounts, then you should always skip the enemy. It is not worth it trying to kill the enemy if it costs you several minutes or so.

You are wasting your time. Move on from trying to kill a single overpowered unimportant minion.