Something like [url=http://forgottenrealms.wikia.com/wiki/Tiefling]this[/url], I assume?

That's a case of requiring some thought and polish as the character from which the power comes would need to come into the equation and possibly be fleshed out as well to best create the abilities of the main character for the roleplay. You can send a CS if you have a working concept of what you want to do with it, but it's a hard one to put into the equation. Still, by the world contexts of the roleplay it is by no means impossible; so if you put in enough thought to the character there is a chance.