Chaos Star (Arteria)

A Medium sphere of unstable energy appears in an occupied space within range. When the spell is cast, and as a bonus action on each of your turns afterwards until the spell ends, you can cause the sphere to send a burst of energy in a 10 foot radius. Creatures in the area must make a Dexterity saving throw, taking 2d8 damage on a failed save and half that on a successful save. Whenever the sphere is activated, roll a d8 to determine the damage type of the energy burst.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 2nd.