Should cost zero HP.
This would make ES fit easier into the rotation. Also, it’s pvp burst would be checked as it then wouldn’t be affected by HP spender dmg modifiers like FR and Judge.
Perhaps increase the ES dmg modifier from 10% to 25% to make up for the loss of spender modifiers.
I mess up and don’t use my judgement buff on it half the time anyways, so I’d be a fan of that. Although, I think the 25% would be a little too insane in pvp. Maybe change the final tier that enhances it to 25%. But honestly I’d be happy with even like 5%/15% if they have it like a 20 or 25 second cool down like it used to have at one point.
Or better yet, make it an ability you can activate not on the GCD, that causes your NEXT judgement to start dropping the hammer automatically. People were complaining about too many buttons to push. This way you can just macro it into some other abilities.