I am currently using this unique on my sorceror, having lots of fun with it. I have a couple of issues though.
First, cremation has no animation. Monsters just cease to exist. The tiny fire aura they leave behind, is that really the AoE? Seems tiny.
Second, destructible environment counts as enemies so you can create skeletons just by destroying crates. That probably shouldn’t happen but maybe not such a big concern.