It does this:
Gives you corruption as one down.
Restores your health to your new max hp.
Plain and simple. You can do with it anything you want. Give it to a new class or all clases. Make cooldown for it or trigger. Take the idea.
My version - give it to everybody to reset their helth status between fights. Call “second wind” or “for the Emperor!”. Forbid its use if your hp is already maxed out and give it 10-20 seconds cooldown.
It’s annoing to reset health now - you should find enemy and give it to hit you on your knees. This ability will fix that and will be very cool to use in a fight. Clutches gone be much intresting.