Adrenaline Transfer

Reduce self max hp by 4 to heal 1 hp every round (starting at casting time) to the target. Lasts until concentration is broken or the target reaches 80% of max hp (rounding up), whichever happens first.

If the spell ends naturally, max hp and equivalent hp lost is restored immediately. If concentration is broken forcefully, max hp will not be restored until the caster's next round. The spell cannot be cast again until max hp is restored.