User blog comment:Vahldeer/Just Another Champion Concept!/@comment-4499945-20120622001904/@comment-4929329-20120622013428

Yes because it fits the champion concept as well. The additional effect could be MR reduction (%) that stacks additively as enemies remain inside of it. Since magic resist items tend to cost a lot, this ult is justified in its power - it's no normal ability, so this reduction comes later in the game.