User blog comment:Willbachbakal/(Champion Rework) Kayle, the Judicator/@comment-25098177-20140705052215/@comment-1330314-20140714012227

Immunity to spells means that the only way to stop Kayle from destroying you would be through basic attacks, something only one or two roles are good at. The current effect, immunity to damage, doesn't make Kayle immune to crowd control, so you can "waste" some of her ult with hard CC. I think her ult is fine as is, and the rest of her kit should be balanced around it and not the other way round (hence removing her instant burst).