Wuthering Waves Game Guide

Synergy
Attacking, Dodging, Counterattacking, and other actions in battle all grant Synergy.

Using Synergy Burst
You can use Synergy Burst once Synergy is full.

Synergy Burst Effect
Synergy Burst immobilizes all enemies, provides numerous battle buffs, and triggers the additional Synergy Burst from the Active Resonator's Bond.