Quote Originally Posted by Winter View Post
Second, they have already shown they can teleport to the Material Plane and cast mega-epic spells (attach at least 63, probably 80+, HD from multiple soul to a mortal and cast some cheated up Extended Timestops). If that does not already count as "bringing immense power to the material plane" then I do not know what could.
Ah, but they can only appear in the Prime Material when offering a deal to a mortal.