Blooming Blade

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal effects and then becomes sheathed in necrotic spores until the start of your next turn. If the target willingly moves 5 feet or more before then, the target takes 1d6 necrotic damage, and must make a Constitution saving throw. On a failed save the target is poisoned for 1 round.

At Higher Levels. The spell’s damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).