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Great idea, but it feels a bit too… oily. Demons would be more fitting for Inferno, or at least as neutral creatures. Creating something like a blood elemental would be more interesting, especially since teleportation has always been associated with devils and archdevils from Inferno. As for Belial’s brothers, I have an idea: a skill called “astral shift” – when a unit is in the astral plane (how else can I explain it?) for the next turn, it’s essentially on two squares at once – the square it’s coming from and the square it’s heading to. This grants it 75% immateriality and the ability to retaliate against attacks, and the catch is that it only retaliates against enemy units that attacked it with a magical attack. What do you think of my idea? It might need some balancing, but it’s something completely new.