Eclipse Bolt

You conjure a bolt of pure shadowy energy and hurl it at a creature within range. Make a ranged spell attack against the target. On a hit, the target takes 1d8 necrotic damage.

The shadowy bolt is imbued with corrupting energy. If the target is reduced to 0 hit points by this spell, the shadows surge through the target, and a 10-foot radius sphere of darkness centered on the target’s corpse spreads out. The sphere lasts until the end of your next turn and is considered heavily obscured. Any creature that starts its turn within the sphere must make a Wisdom saving throw or be frightened until the start of its next turn.

At Higher Levels. When you reach 5th level, the damage increases to 2d8, and the radius of the darkness increases to 15 feet. At 11th level, the damage increases to 3d8, and the radius of the darkness increases to 20 feet. At 17th level, the damage increases to 4d8, and the radius of the darkness increases to 25 feet.