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? What is Bonded Brave Burst(BBB) and Bonded Super Brave Burst (BSBB)? How do I increase a Bond Level? Where do I get Distilled Ethers? How do I create a DBB-unlocked unit?