Black Flame Pursuers

You summon five orbs of black flame that float around you. Whenever a hostile creature enters, starts, or ends its turn within 15 feet of you, you can use your reaction to send any number of orbs to aggressively pursue the target. Targets must make a Dexterity saving throw at Disadvantage for each pursuer. On each failed save, a creature takes 2d8 Fire damage and 2d8 Necrotic damage and cannot have its Hit Points restored until the end of its next turn. On a successful save, it takes half as much damage but still suffers the additional effects. Constructs automatically succeed and take no additional effects.