I used an air elemental once and it got wasted quick. Possibly i used it
at the wrong time but none the less it was the last time i used it. I used the earth a few times and didn't care for it either. On the other hand greater fire elementals single handedly cleared a few dungeins for me.
Although not an elemental (maybe close though) and not a spell summoned creature, I liked the shambling mounds too.
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Balance