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I remembered that in the fourth game, Death had a fifth-level spell that killed a specified number of creatures in a single stack. I rarely used it; I couldn't complete the default Necropolis campaign, and my Storm Priestess mostly caused chaos through poison, plague, and a bucket of popcorn. Thinning out the third or fourth tier is very useful, but it's pointless against small units.
I'm saying that an AoE spell that kills a fixed number of units in all stacks is a broken, overpowered ability.