I read on here somewhere that the passive healing from Peace mastery works on Earth Ele summons. I've tried it, but it doesn't seem to be working. It does work with another player in party mode, just not my summons and not in party mode. I must be doing something wrong. Do you have to summon first then activate the mastery, or mastery first then summon? And yes, I am staying within range for the effects to reach my summons.