Synergy is a Weapon Mod in Destiny 2.
What it does
Final blows with this weapon have a chance to create an Elemental pickup matching its damage type, or an Orb of Power for weapons that deal Kinetic damage.
Source
Requires Shaped or Enhanced Weapon
More Weapon Mods
Abundant AmmoWeapon Mod
Adept ImpactWeapon Mod
Adept MagWeapon Mod
Adept RangeWeapon Mod
Adept ReloadWeapon Mod
Adept TargetingWeapon Mod
AftershockWeapon Mod
Anti-FlinchWeapon Mod
BandolierWeapon Mod
Chaotic MotionWeapon Mod
Counterbalance StockWeapon Mod
Marksman Optics: HighWeapon Mod
Marksman Optics: LowWeapon ModOverflowing HolsterWeapon Mod
Stay in the FightWeapon Mod