Can someone explain how it works?The description says it allows the caster to summon 4 elementals.Doest it mean that you can summon 4 at a time.If that is the case,isn't this spell too powerful?

To the best of my knowledge, it does summon 4 elementals at once.

Is it too powerful? Well, first off, you still need to have your party protected by a protection from evil spell before summoning elementals.

Secondly, you still won't be able to control them.

And third, it *IS* a 9th level spell. It's supposed to be very powerful.