Is it possible to stop other players from channeling their ultimates; for example, Karthus' Requiem or Fiddlesticks' Crowstorm?

Which champions have this ability?

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2 Answers

To interrupt another player's ability (regardless of whether or not it is channeled or cast time -- it's the same ways for both) you can stun them, silence them, or kill them before the cast-time completes.

All channeled abilities can be interrupted by the channeler if you press "S" (Stop), click to move somewhere, or your champion gets stunned, silenced, knocked up, or otherwise interrupted. Knockback alone is not enough to interrupt a channeled cast, as shown here

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You forgot Knock-ups and Knock-backs. Lee sin's ult and Alistar's pulverize Also stops channeling. Blitz' pull. Anything that involuntarily moves a champion will stop the channeling! Damage will not, however. Also, Be careful when using Fiddlestick's ult or Karthus ult! If you flash before the channeling finishes, the Ult WILL get interrupted! You'll lose the cooldown for your ult. So make sure you finish channeling before you flash in!

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