How many Synergy Shards does it take to activate Dual Brave Burst? gumi Support Team - June 19, 2019 07:40 Please refer to the individual unit information found in the DBB UNIT DETAIL. IMPORTANT NOTE: The Synergy Shards cost will reduce at certain bond levels. Have more questions? Submit a request Comments Related articles [Unit Detail] Which units are DBB-eligible? What are the ways to charge up the Synergy gauge? What is Bonded Brave Burst(BBB) and Bonded Super Brave Burst (BSBB)? Can I have 2 separately DBB-bonded units on one squad?