What is Dual Brave Burst Progression? gumi Support Team - July 25, 2019 08:19 The progression system allows Summoners to increase the effectiveness of their Bonded DBB Unit's skills. Have more questions? Submit a request Comments Related articles How do I activate BBB/BSBB? Getting the best out of Jewel Runs! How do I increase a Bond Level? Where can I use DBB? [Event] Brave Frontier Level Up Campaign!