I think Magnus is right, there was definitely something like that. We need to see if anyone played as them in the demo. If so, please tell us how it works for them.

I played the demo version and played as those stupid little devils! At first, I couldn't understand what their "siphon magic" (or something like that) was! It seems like they steal magic from enemy creatures and lose a turn in the process. Imps are better. They steal mana and then still get to move, but the devils only do one thing!
P.S. By the way, why did everyone's level drop? I had a Master Archer! Magnus, you had a Rakshasa Princess, and eXeCuToR, you already had a Druid! Does anyone know why?