I know, right? Karthus's ult can be dodged. And it is just the most annoying thing in the world when you know you've done pretty much bet everything on this one ult only to have it dodged by the person you're trying to kill.
I'm not talking about characters that can heal themselves out of your ult, such as some supports of the use of
. I'm talking about those that can just plain avoid it.
Avoiding Karth's ult is a matter of timing. If champs can't time their skills right, they risk being hit by your ult. Learn or approximate the cool downs of each of their abilities to know how you can find an opening for a perfect ult. In most cases, ulting right after they just used such an ability is a good idea, for most of the cool downs for these skills take longer than 3 seconds.
Anyways, here's a list of people that can completely avoid getting hit by your ult.
-Her Spell Shield blocks your ult and gives her Mana.
-His Shroud of Darkness blocks your ult, and also increases his Attack Speed.
-He can use his Sanguine Pool to dodge your ult.
-Two second invulnerability is all she needs to block all your damage from your ult. And she can even cast it on high value targets that you want to ult, but can't since they're protected.
-In her Spider Mode, she can disappear up into the air. Then she can land on you after you've ulted to finish you off.
-Playful/Trickster makes him untargettable, and therefore nullifying your ult. He has to be pretty exact though, as he can only stay that way for half a second.
-Annoying as heck, Diplomatic Immunity grants her, well, immunity from your ult for a LOOOOONGGG time provided she has targeted a champ other than you. The only limitation to this is that she has to target a champion other than you, otherwise, this trick of her's won't fly.
-Blade Waltz allows her to be untargettable, so she can dodge your ult, however, she's probably only gonna be doing this in a team fight, and you can still hit her with your E
. Like Poppy, she also needs a champ to target for this to work for her.
-Uses ult to dodge you if he targets a champ, and if he targets you, count on being dead.
-Alpha Strike is a shorter lasting version of Fiora's Blade Waltz, but it still has the same effect, though even though Yi can target anybody using this trick and still dodge you, the duration varies depending on the amount of enemies there are, and even then, it is still a short time.
-Twisted Advance works the same way, needs to target someone, stays untargettable until the move is complete. Though Maokai aren't usually smart enough to dodge your ult in this way, it is still possible.
And then here are some special cases. These guys can't block your ult, but they definitely have ways to survive it.
-Her passive Rebirth gives her a second life, so even though your ult may kill her, you have to kill her egg as well. There goes your ult.
-Undying Rage gives him invincibility almost, and for 5 seconds, he could be using the time when you're ulting to smash you to pieces.
-Passive allows him to live, but split into blobs. He may not live after that, but you might not get the kill in the end.
-Bloodwell is basically a Guardian Angel for free.
The other champions not on this list may choose to itemize against you.
-Has a Spell Shield to block your ult, and frequently too. I suggest using your other skills to bring down the Spell Shield first and then ulting.
-Grants immunity and they can't be targeted by your ult.