[Snake]

Charred Void should either require a threshold to be active, like above 30 Void Energy, or reduce your Void Energy regeneration by 1. And perhaps once you've reached this threshold, you take 1 Null Damage on round end.

This would make it more usable than it is right now.

The Cinders could also do bonus damage equal to your current Void Energy, a flat number. Those two together would make it definitely not a waste of a skill point on something thematically fun.