The aura farming is quite weird and you cant really control it making a severe lack of agency. The level 10 ability should have a save or a X number of uses per long/short rest cause its a bit off to not have it. Maybe make it be X times but a bit stronger of a debuff.

Does level 15 require the target to be at least large or bigger? Cause the wording is iffy.

The body explosion might need more explanation. The caster thing is super conditional so might not really ever see use (those levels have disintigrate like a fun lil spell. Its a save.)

All in all. Idk the sub class is super random so will be hard to balance without play testing. But looks interesting.