I believe it only works on elementals and your own summons. This makes it situational but this spell had helped me out of many a tight spot. Also, it’s great when your summon is charmed.
Apparently, "summons" has to be summoned after the battle began.
Completely broken. All summons says "invalid target".
What counts as a summon? It only works on summons that my characters summon. Nothing that is an actual enemy.