Cover of Darkness is a Spell.
This card can also be obtained from The Dusk Road Card Packs. Diamond Chests and The Dusk Road Card Packs can give Premium versions of this card.
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Should Cover of Darkness's targets be killed in response to playing it (i.e. by a Torch), the Nightfall effect will still happen even if the spell has no longer has targets.
This card was revealed as a The Dusk Road spoiler in Dire Wolf Digital's mechanic reveal announcement for Nightfall.