well, unless you take some energy-boosting items / armour, you won't be able to cast a lot of the AoE skills. One option is to rush in with Armour of Mist, (can't attack / be attacked) spam some AoE then run out again quickly.
Warrior / Elem isn't really viable for much AoE damage unless you have some energy management skills, which reduces the skill space for your warrior and AoE skills.
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