Basically if you can think of something magic and twist it so that it uses your aura (and ain't too OP), it can be a sembalance. The more powerful the sembalance the quicker it drains your aura. 

My brother offered an idea of a Death Aura, where you have a set range say, I dunno, a yardish, and when you activate your sembalance everyone but you in that set area, (you are the center with a yard of space in all directions) feels like they are being beaten up by at least ten of you and you don't even have to move a muscle. However this would burn through your Aura like wildfire. You could modify it of course. Great sembalance for a villain I reckon, but up to you.