Until the end of this turn, all DARK Spellcaster-Type monsters with 2000 or more ATK you currently control cannot be destroyed by battle, their effects are negated, also they are unaffected by your opponent's card effects.
How to Get
Protects your monsters from battle destruction.
Protects your monsters from opponent card effects.
It only works with specific kinds of monsters.
Negates your monsters’ effects
Boost a DARK Spellcaster monster’s attack so it can be protected by Black Illusion.
With Necrovalley active most Gravekeeper monsters can be protected by Black Illusion.