Accretion disk

As you cast this spell, all dust around you start orbiting you at higher and higher speeds around you forming an Accretion disk. This gives a +2 to the caster's AC, and creates a 30ft. radius area around the caster where the dust is orbiting. If any creature who is hostile to the caster enters or starts their turn there, takes 23 (5d8) Fire damage and 23 (5d8) magical Slashing damage. This is limited to once per round. Additionally, this area is considered Difficult Terrain for hostile creature and inflicts Disadvantage on Dexterity based rolls.