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The Darkness is a defensive Two Fingers Incantation found in Elden Ring, unlocked by the Assassin's Prayerbook.
Darkness can be obtained from the Assassin's Prayerbook, which is located past the second Imp Statue Door in Roundtable Hold. Once picked up, it can be given to either Brother Corhyn or Miriel and is then sold for 2,000 Runes.
Darkness creates an area of darkness that conceals the caster, temporarily blinding enemies and making them unable to see you so that they will drop out of combat, allowing for you to either escape or get behind enemies to unleash critical strikes.