Tanith's Rift of Flame

You make a series of arcane gestures and a swirling rift appears on the ground in a
5ft radius centered on you. For the duration, you and any ally standing within the rift can add
1d6 fire damage to any attack made while standing in the rift.
At higher levels: Casting this spell in a 3rd level slot increases the bonus damage to 2d6.
Casting it in a 5th level spell slot increases the bonus damage to 2d10.
Casting it in a 7th level increases the bonus damage to 5d6.
Casting it in a 9th level spell slot increases the bonus damage to 5d10.