Chaos Aura

This spell creates an aura of chaotic energy around the caster that restores a number of hit points to any allies within a 10-foot radius and enemies within range take the same amount of necrotic damage at the start of each of their turns and when they enter the aura for the first time or start their turn inside of the aura. The aura lasts for a number of rounds equal to the caster's Charisma modifier plus their proficiency bonus, and it restores a number of hit points equal to the caster's spell attack modifier. This spell requires concentration

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the radius of the aura increases by 10 feet for each slot level above 3rd.