Do the DBB & UBB effects stack? gumi Support Team - June 18, 2019 11:14 They do NOT stack. However, the most recently activated effect will override any same effect. Have more questions? Submit a request Comments Related articles What is Elemental Synergy? Does DBB trigger UBB counters/punishments? In what countries is Brave Frontier Global available? What is Dual Brave Burst Progression? What is Bonded Brave Burst(BBB) and Bonded Super Brave Burst (BSBB)?