Blacklight

Magical darkness spreads from a point you choose within range to fill a 20-foot emanation for the duration. The darkness spreads around corners. A creature with darkvision can't see through this darkness, and nonmagical light can't illuminate it, though you treat the area as dimly lit.

If the point you choose is a willing creature or on an object you are holding or one that isn't being worn or carried, the darkness emanates from it and moves with it. Completely covering the source of the darkness with an opaque object (such as a bowl or a sack) blocks the darkness.

If any of this spell's area overlaps with an area of light created by a spell of 3nd level or lower, the spell that created the light is dispelled.

Adapted from the Forgotten Realms Campaign Setting (3e).