"Old hag" character concept, black magic wielder troll

I know some time ago people said the League could use an "old hag" champion, and several people mentioned a female troll that uses black magic. I decided to give it a try at drawing. I don't have much time for this though, so it's just a rough sketch. This design is not very original, I've seen similar iterations in many fantasy games. League though still doesn't have something similar to this.

https://41.media.tumblr.com/a65c6dae6b7ec2f0084551945e2761e0/tumblr_nv2u1g5iCa1tbpqalo1_540.png

The thing on her back could be "confusion eyes" or some other magical artifact, it just felt empty without something on her back. Here's a version without those:

https://36.media.tumblr.com/b904efadafa47f320ddaa4d229ff2870/tumblr_nv2u1g5iCa1tbpqalo2_540.png

I'm not pretty good at abilities, if anyone's interested, you could add some ideas.