Effect
When a Spell/Trap Card, or monster effect, is activated, while both a "Gravekeeper's" monster and "Necrovalley" are on the field: Negate the activation, and if you do, destroy it. You can only activate 1 "Imperial Tombs of Necrovalley" per turn.
You can activate "Royal Tomb of Necrovalley" if a "Gravekeeper's" monster is in either player's Monster Zone and "Necrovalley" is face-up on either player's field.
You can activate "Royal Tomb of Necrovalley" even if "Gravekeeper's Oracle" is face-up in a Monster Zone and its monster effect that makes the field "Necrovalley" is being applied.
This effect does not target. It is an effect that is activated directly in response to the activation of a monster effect, or the activation of a Spell/Trap Card. (It cannot be activated in response to the activation of a Spell/Trap effect.)
This effect can also be activated during the Damage Step.
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