Cloak of Compounding Flames

For 1d4 rounds, your flames turn bright blue and increase in heat. Each turn (including this turn) you inflict fire damage on a creature, any successful fire attack made on the following turn adds an additional 1d6 fire damage. Successful fire attacks made on the following turns after that continue to add an additional 1d6 damage/turn for as long as the cloak remains

At 7th level, the damage bonus escalates each time fire damage is dealt, regardless of turn