User blog comment:Poisonshark/On what not to do with Custom champions, Buff McStrongmuscles/@comment-24795478-20140802172541/@comment-25235491-20140802220242

Area of effect spells still hit you when you're untargetable, I think.

If he entered the aura of a Sunfire Cape, he'd still take the damage. He could be damaged by. Even though I agree that damage reduction is redundant. But hey, it's only one more thing about "what to not do", right.