Auto-translated
Please explain in more detail the ABILITIES of the WATER, LIGHT, and DARK elementals.
Everything seems clear with Earth. I know that DARK is good in combat. But I didn't understand what the DARK abilities are. And I haven't used LIGHT and WATER at all.
Light has a retaliatory attack, which is an 8-pointed star that damages all enemies hit by the rays and heals allied units that are hit by the rays. It also returns some percentage of the damage received.
Dark elementals remove positive spells from enemy units, similar to the "Radiance" spell.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!