Rules FAQ
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When Cressen is killed, he leaves play first, then his reaction can be triggered from the dead pile. He shares the reaction window with cards that react to a character being killed (like Wyman Manderly), or cards that react to a character entering the dead pile (like Warlock of Qarth).
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Cressen's reaction can be triggered if he enters the dead pile for any reason, not only if he is killed. This includes cards like Heads on Spikes, Crone of Vaes Dothrak and Hired Assassin, among others.
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If Cressen is killed while Warlock of Qarth is in play, the first player has the first opportunity to trigger a reaction. If Warlock of Qarth is triggered first to put Cressen into play, Cressen can no longer be triggered afterwards, because his reaction can only be triggered from the dead pile. But of course he can be triggered at the end of the phase when he is placed in the dead pile again.
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If Cressen is immediately killed when he comes out of shadows (for instance, by Blood of the Dragon), you can trigger his reaction to entering the dead pile, but not his reaction to coming out of shadows.
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If you use a replacement effect like Spears of the Merling King that prevents Cressen from entering the dead pile, you cannot trigger his reaction. On the other hand, you can trigger his reaction if Cressen is placed in the dead pile by the ability of Caggo Corpsekiller.
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You cannot trigger Cressen if you are not playing an agenda.
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Cards under a player's agenda are not considered to be in play. They are essentially removed from the game permanently, unless that player is playing The Conclave or Archmaester Marwyn. A player can always look at any facedown card under their agenda.