Sending 1 DARK monster to the Graveyard is a cost to activate the effect which destroys all of your opponent's monsters.
If " Darklord Zerato" activates his effect and is face-down during the End Phase, he will not destroy himself. If " Darklord Zerato" activates his effect, is flipped face-down, and then is flipped face-up, then he will not destroy himself during the End Phase.
Konami FAQ: Effect Monster > Darklord Zerato
Konami FAQ: By Tributing a face-down DARK monster, can "Darklord Zerato" be Tribute Summoned?
Konami FAQ: By Tributing 1 monster, can "Darklord Zerato" be Tribute Summoned face-down? ↑
Konami FAQ: When "Darklord Zerato" is face-down, do you activate his effect which destroys himself during the End Phase?
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