If you are ever worried about whether or not your ability is acceptable, here is a list of ability that we do not allow, in no particular order:
Future Prediction.
Reality Manipulation.
Time.
Lifesteal.
Aura Steal.
Semblance Copy.
Blood/Internal Manipulation.
Monster Summoning.
Multi-element.
God Mode.
Insta-Kills.
Black Holes.
Auto-Hits.
Sacrificial Semblances.
Sound.