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? Other units are unable to attack during the DBB animation, is this intended What is Bonded Brave Burst(BBB) and Bonded Super Brave Burst (BSBB)? What is Elemental Synergy? What are the ways to charge up the Synergy gauge?