I just don't understand this thinking. A lot of the stuff in the PHB only works at the "realm" level. Does fireball work the same in the Elemental Plane of Water? Magic appears to work quite differently between Eberron and the Forgotten Realms. I mean, it is indicated all throughout the Eberron book. And since everyone keep bringing up Barovia, isn't there a section in there that literally talks about how spells work and look differently, say turn undead or raise dead? (I don't have the book on me, and it has been a while since I've read it.)