Control Shadows

You cause shadows you can see within range to animate as you like. For the duration, as an action, you can have one target you can see make a Dexterity saving throw against a moving shadow. The target can't benefit from the Dexterity saving throw bonus granted by Half Cover or Three-Quarters Cover. On a failed save, it takes 1d8 Necrotic damage.

The spell assumes there is at least one light source casting shadows in the area (DM's adjudication).

Cantrip Upgrade. The spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).

Homebrew spell