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? How many Synergy Shards does it take to activate Dual Brave Burst? What is Dual Brave Burst Progression? In what countries is Brave Frontier Global available?