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Missing the Timing: Because "Desrook Archfiend"'s effect is optional, the "Terrorking Archfiend" being sent to the Graveyard has to be the very last thing that happened in order for you to activate "Desrook Archfiend"'s effect. You cannot activate "Desrook Archfiend"'s effect in the middle of a chain, such as if "Pot of Greed" was activated and "Ring of Destruction" was chained to destroy "Terrorking Archfiend" and send him to the Graveyard in the middle of the chain.
Missing the Timing: Because the effect of "Desrook Archfiend" is optional, the "Terrorking Archfiend" being sent to the GY has to be the very last thing that happened in order for you to activate the effect of "Desrook Archfiend". You cannot activate the effect of "Desrook Archfiend" in the middle of a chain, such as if "Pot of Greed" was activated and "Ring of Destruction" was chained to destroy "Terrorking Archfiend" and send him to the GY in the middle of the chain.
You can activate "Desrook Archfiend"'s effect when a face-down "Terrorking Archfiend" is destroyed and sent to the Graveyard by a card effect.
You can activate the effect of "Desrook Archfiend" when a face-down "Terrorking Archfiend" is destroyed and sent to the GY by a card effect.
"Desrook Archfiend" is a Multi-Trigger Effect and can be activated during your opponent's turn, and even during the Damage Step.
"Desrook Archfiend" is a Quick Effect and can be activated during your opponent's turn, and even during the Damage Step.
When you control your opponent's "Terrorking Archfiend" with "Change of Heart", and it is destroyed, you can activate "Desrook Archfiend" from your hand to Special Summon the "Terrorking Archfiend" back to your side of the field.
While "Pandemonium" is active, and you have "Desrook Archfiend" in your hand, and your "Terrorking Archfiend" is destroyed while on the field, "Pandemonium" is Step 1 of a chain , but you can use "Desrook Archfiend" as Step 2 of the chain. Then you would get to Special Summon the "Terrorking Archfiend" and select a Level 3 or lower Archfiend from your Deck.
If multiple "Terrorking Archfiends" are destroyed at the same time, only one "Desrook Archfiend" may be discarded to Special Summon one "Terrorking Archfiend."
ARCHFIENDS: The following rulings apply to "Vilepawn Archfiend", "Desrook Archfiend", "Shadowknight Archfiend", "Darkbishop Archfiend", "Infernalqueen Archfiend", "Terrorking Archfiend", and "Skull Archfiend of Lightning".
"Desrook Archfiend", if retrieved by the effect of "Pandemonium" from a "Terrorking Archfiend" being destroyed and sent to the Graveyard, may not be used to Special Summon "Terrorking Archfiend" from the Graveyard.
If you don't have enough Life Points to pay for an Archfiend, the Archfiend is destroyed and you don't pay the cost.
If the activation or effect of a card that targets your Archfiend is negated by some other card, then you do not roll a die for the Archfiend.
If your Archfiend is targeted by "Barrel Dragon", roll a die for the Archfiend before flipping coins for "Barrel Dragon".
Rolling a die for an Archfiend cannot be chained to since you are resolving an effect.
The effect of rolling a die for an Archfiend is a Trigger Effect.
The effect of rolling a die for an Archfiend will be negated by "Skill Drain".
You can roll a die for an Archfiend during the Damage Step.