Aira's Flurry of Fire

You touch a willing creature and empower their fists with escalating, searing flames. For the duration, the target's unarmed strikes deal an extra 1d6 fire damage.

Each time the target hits a hostile creature with an unarmed strike on their turn, this extra damage increases by 1d6 for subsequent attacks, up to a maximum of 5d6 per hit. If the target misses an unarmed strike on their turn, the bonus is reduced by 1d6 (to a minimum of 1d6). Failing to make an unarmed strike on the target's turn resets the bonus back to 1d6.

At Higher Levels: When you cast this spell using a spell slot of 5th level or higher, the maximum damage cap increases by 1d6 for each slot level above 4th.