Doesn't sound like equilibrium to me. More like energy control on your end.

Get a bit more creative with that concept. Maybe an ability that forces enemies in an area to be teleported to your altitude? Or you can teleport yourself to an enemy's altitude. Equal altitude. Maybe a gambit attack that heals you based on your difference in health with the enemy you attack? There are many ways you can take the concept, "evening the odds", "on the same page", "balance".