Cool ideas Krish. Sorry for not responding, I was doing something at some other place and forgot that I had something to respond to in another place thingy and forgot another thingy thingy... erm...
I was thinking of making some undeads that might have a more permanent effect like FireBone. Elemental damage thingy.
Bone Bomb is actually already in Necromancers Legacy 1 (under a different name though, same concept)