Bloodline Tendril

You extend your arm, from which bursts a tendril of dark blood to lash at a creature or object within range. Make a ranged spell attack against the target. On a hit, the target takes 2d4 necrotic damage. Any time the tendril touches something, it leaves a red smear on the surface.

This spell's damage increases by 2d4 when you reach 5th level (4d4), 11th level (6d4), and 17th level (8d4).