You say a quick invocation to create a black nimbus around your hand, then hurl three rays of darkness at one or more targets in range. The rays can be divided between targets however you like. Make a ranged spell attack for each target (not each ray each ray that hits does 1d10 cold damage. A target that was hit by any number of rays must make a successful Constitution saving throw or be unable to use a reaction until the start of its next turn.