Active when you have certain number pieces of this class on board, each level of the same synergy effect stacks 3: All allied Assassins gain a 15% chance to exert 300% damage, and a 40% chance to deal 300% damages with their first Base attack in each round 6: All allied Assassins gain a 20% chance to exert 350% damage, and a 60% chance to deal 350% damages with their first Base attack in each round 9：All allied Assassins have 30% chance to deal 400% damages, and have 100% chance to deal 400% damages with their first base attack in each round