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 What is Bonded Brave Burst(BBB) and Bonded Super Brave Burst (BSBB)? Can I have 2 separately DBB-bonded units on one squad? I'm stuck in Brave Frontier's tutorial, is something wrong?