What having a Karthus on your team SHOULD feel like.

After looking throughout many of the Karthus related posts on the boards today I've decided to think about exactly what having a Karthus in a game is supposed to feel like. In-Game I think that Karthus is supposed to give off a feeling of Inevitability, which is why his Early game is weak, but his Late game is Monstrously good. It's why his Ult is so powerful, yet it's on a 200 Second CD to start with. It's also why I feel that with the new Assassin item as well as all the mitigation abilities currently in the game, I'm supporting the decision from other players that Karthus's ult should be able to pass through invulnerability and Spell shields.

Now, this doesn't mean everything gets passed through. Untargetability, Regular shields, and heals can still be counterplay to Karthus's ult, but passing through invulns and spell shields will provide Karthus with a Niche mechanically, and thematically, It'd give Karthus players the true feeling of inevitability that the opponent is Going to Die at some point.