Veil of Ash

3rd-level transmutation
Casting time: 1 action
Range: 30 feet
Target: Any creature that moves within 5 feet of the wearer
Components: V, S, M, (a pinch of ash)
Duration: Concentration, up to 10 minutes
Classes: Sorcerer, Wizard, Warlock
Subclasses: --

You create a swirling aura of ash and volcanic cinders around yourself or an ally within range. Any creature that moves within 5 feet of the wearer for the first time on a turn or ends its turn there must make a Dexterity saving throw. A creature takes 1d10 fire damage on a failed save, or half as much damage on a succesful one.