Just to make sure, with the destroy set, it only reduces the max HP a character has, but it has no impact on the actual HP they have currently (assuming their HP is not topped off), right?  This set is just not seeming like something that great, except for maybe a fight like the "spirit keep" dungeon, right?  Just seems to me like a set that is VERY conditional, since if it doesn't get applied to healer or someone who gets healed in the fight later on, doesn't seem to do any good?