Crimson Splatter

You splash a number of creatures within range with your own blood, commanding your vital essence to boil and steam. Choose one creature within range, or choose two creatures within range that are within 5 feet of each other. A target must succeed on a Dexterity saving throw. If they fail, they take 1d6 acid damage and their speed is reduced by 10 feet until the end of their next turn. On a successful save they take half as much damage and their speed is not reduced.

This spell's damage increases by 1d6 when you reach 5th level (2d6), 11th level (3d6), and 17th level (4d6).