Dark Shadow Smite

The next time you hit a creature with a melee weapon attack during this spell’s duration, your weapon flares with a bright light, and the attack deals an extra 2d8 necrotic damage and 1d6 force damage to the target. Additionally, the target must succeed on a Constitution saving throw or be grappled until the spell ends as shadow hands grab and pin them.

A creature grappled by this spell makes another Constitution saving throw at the end of each of its turns. On a successful save, it is no longer grappled.