hi, i think it would be a positive change, if is not too cpmplicated, to split the witch feature into two more generic configuration:
-mob spawn from death
-mob support

so that is possible to set mobs that can buff other mobs different than mobs who can spawn bats.
Also it would be great if instead of spawn only bats, to make the feature more generic allowing different mobs to be spawned after mob kill

Good ideas. I’ll look into it.