Looks really a bit overpowered to me...
Even with the current bunch of chance-to-cast (which has lowish 3-5% chance to cast lowish 3-8 level spells), I'm already casting a lot and killing pretty decently in hell. This weapon not only has HUGE chance to cast a HUGE volcano but has very good fire damage and even 55% crushing blow on top of that. Throw in the removal of global physical resists + the very fast attack speed and the killing speed will be gross (especially if you can max out the crushing blow %). And if that's not enough, you get immunity to magic attacks (think bone spirit, berserk) too!?!
I can't imagine how much the monsters are going to be souped up in order to create a balance if it is to stay.
Even with the current bunch of chance-to-cast (which has lowish 3-5% chance to cast lowish 3-8 level spells), I'm already casting a lot and killing pretty decently in hell. This weapon not only has HUGE chance to cast a HUGE volcano but has very good fire damage and even 55% crushing blow on top of that. Throw in the removal of global physical resists + the very fast attack speed and the killing speed will be gross (especially if you can max out the crushing blow %). And if that's not enough, you get immunity to magic attacks (think bone spirit, berserk) too!?!
I can't imagine how much the monsters are going to be souped up in order to create a balance if it is to stay.