Thorn Burst

The next time you hit a target with Eldritch Blast or Pierce of the Rose after casting this spell within the span of 1 minute, a large Rose will bloom at the center of the impact, and then burst, it's petals slicing through the air like blades. Any creature within a 10ft radius of the original place of impact need to make a Dexterity saving throw. If they fail, they take 1d8 slashing damage.

At Higher levels: for each level above 1st that this spell is cast, it does an additional 1d8 slashing damage.