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Fire elementals are standard, although the explosion after death is a nice touch.
Water and light elementals have useful abilities, but the fact that they are a repeat is a big drawback for the developers.
The element of darkness rules! Excellent abilities, good speed. Summoning these creatures is a must-have.
Everything seems clear with earth. I know that darkness fights well. But I didn't understand what the abilities of darkness are. And I haven't used light and water at all.