Yes, specifically regeneration used at zero dots. She _can_ suppress this, but since she automatically succeeds on the control roll and it runs on its own without her conscious control, adding a dot to stamina seemed like the easiest way to model the result.
As for the hellfire… I think it'll work something like this:
- Kana can target any object or being within her mental range. Due to her high mind control rating this includes souls.
- Once per round, the target of the hellfire rolls resistance + stamina vs. Kana's Hellfire rating. This also happens vs. objects. Which normally just lose.
- If the number of victories (not total successes) for the target exceeds that of Kana, then the fire does out. This can happen on the first turn.
- Otherwise, the target takes a number of health levels of damage equal to the net number of victories that kana has accumulated. This is subject to soak and hardness.
It's a fire. Fire grows, and it can grow quite dramatically if she wants it to. If the net victory number exceeds Kana's Wits+Integrity rating when the hellfire is done with its target, then she needs to win a roll of wits + integrity at difficulty 2 to avoid having it jump to a nearby other possible target. On a failure the target number increases by one.
Kana can make the same roll at any prior time to prevent further growth, at difficulty 1.