Draconic Fury

You briefly summon spectral claws that lash out in a flurry. All creatures in a 15-foot cone take (1 + (your level ÷ 4, rounded down))d6 slashing damage with a basic Reflex save against the higher of your class DC or spell DC. A creature that critically fails the save also takes 1d4 per 4 levels persistent bleed damage. If you are Channeling Draconic Essence, your spectral dragon's space can be the origin of the cone.

At 8th level and every 4 levels thereafter, the initial damage increases by 1d6 and the persistent bleed damage on a critical failure increases by 1d4.