Ment
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To be honest, Zero makes me feel UNCOMFORTABLE. I think the last note from the UNDEAD perfectly describes what I was thinking.
I can't find any weaknesses in him at all; he can do anything, and I doubt it will be something like "haha, Zero, help the city if you want it to survive, heal us, block the bad guy." He has three AoE spells ready to use, one of which is guaranteed to hit. The Fog has no chance against him, even if it somehow figures him out, because he can save his own killing blow for the Fog.
To sum it all up