Calathar's Cyclone Chakram

You create a whirling disk of razor wind which hovers near your palm. Make a ranged spell attack against the target. On a hit, the target takes 1d10 slashing damage. Hit or miss, the caster may then specify up to 3 targets within 15 feet of the initial target . Each creature selected must then succeed on a Dexterity saving throw or take 3d6 lightning damage, each creature caught in the path of the Chakram's return to the caster must additionally make a Dexterity saving throw, or suffer 1d6 slashing damage. The caster may then use the Chakram as a bonus action on each turn following the initial cast, for the duration of the spell or until concentration is broken.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the lightning damage increases by 1d6 for each slot level above 3rd. Additionally the caster may select an additional creature to make a dexterity save.