User blog comment:Emptylord/Leaked Champion: Vel'Koz/@comment-9705522-20140203160407/@comment-3974211-20140203160813

I really don't think "not being ice-themed" is a hole in the theory. That makes the assumption that a being capable of granting immortality isn't capable of wielding multiple visual-themes of magic. It's more likely that the Watchers simply draw magic from their surroundings - ice from the Freljord and nether-energy from the Void.