Pyre Rite is a 60 power heal + 10SP recovery for allies, but you must target an ignited enemy for it to trigger. Right now this ability can be obtained from tier 1 fiery modifier. Which is kind of weird because the first demon that has it as a part of its starting set is lvl 22 Baphomet. And mass heals don't appear until late game, as far as I remember the first mass heal ability is Ninkasi's (lvl 21) rallying cry.
Just got absolutely steamrolled by a pack of fiery raichos who had pyre rite and ember burst as their bonus abilities. Didn't have enough damage to burst them down in one turn and on the next turn they would be fully healed again. And of course they couldn't run out of SP because pyre rite costs only 10 SP.