Karthus, Eternal
Unofficial Riftbound rulings for Karthus, Eternal, with rules explanations, examples, and Core Rules citations.
Does Karthus, Eternal's ability apply if he dies from the same effect as the unit with Deathknell?
Karthus applies to your other unit's Deathknell if the deaths are simultaneous or that unit is killed before Karthus. He doesn't apply if a separate kill action kills him first.
When one kill action kills Karthus and another unit simultaneously, as with The Ruination, the other unit's Deathknell is added before the kill instruction moves Karthus off the board. His passive ability is therefore still active and makes your Deathknell effect trigger an additional time. If one effect instead performs separate kill actions, those deaths are sequential. Karthus applies only if the Deathknell unit is killed first, because his passive ability is active only while he remains on the board. When both units instead have lethal damage during a cleanup, all relevant death triggers are added before either unit is killed and moved to the trash.
Does a single Not So Fast counter both Deathknell triggers when Karthus, Eternal is on the board?
No. If both Deathknell triggers are legal targets for Not So Fast, one copy can counter only one of them.
When a friendly unit with Deathknell dies while Karthus is on the board, his ability causes that Deathknell to trigger an additional time. Each trigger is added to the chain as its own independent pending item. Not So Fast targets a single spell or ability, so each copy can counter only one trigger.
This applies only when the Deathknell ability chooses one of your friendly units or gear. Otherwise, Not So Fast cannot target either trigger.
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Written by Christian “Near” Ivicevic.
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