Edited the first post to include some musings on an idea on how to increase 'how much healing is required', via a new system I'd call 'Aetherblight', effectively Heal Absorbs from other games. Here, however, we could include additional functionality to the debuff, such as letting it be negated entirely if the player who it'd apply to has a barrier applied (which changes how a Healer might approach tackling the effect), or making it cleansable via Esuna (for example, if a Savage raid has a mechanic that applies '100% of your max HP' to everyone as Aetherblight, is it worth it to heal through that on all 8 players, or is it better to split up the two healers to cast Esuna on 4 players each?)