Dark Blade (Bladespell)

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within the spell's range. On a hit, the target suffers the weapon attack’s normal effects, and you pin the target's shadow in place, reducing their walking speed by half the damage dealt rounded down until the start of your next turn.

This spell’s damage increases when you reach certain levels. At 5th level, the melee attack deals an extra (1d6) necrotic damage to the target on a hit, at 11th level it increases to (2d6) and 17th level it increases to (3d6).