Data Values from: https://lost-ark.maxroll.gg/resources/party-synergies The same synergy effects from two identical classes do not stack. This is also true for opposing gender versions of Wardancer (Striker) and Deadeye (Gunslinger). Form your party with unique classes that complement each other with their synergies. Crit Rate and burst oriented synergies can be extremely powerful if properly utilized by everyone in a party.