Collective Action is a trait in Destiny 2 that can appear on 63 weapons. There is also an enhanced version with a stronger effect.
What Collective Action does
Collecting an Elemental pickup or destroying a Tangle grants this weapon a stacking period of increased damage. Throwing a Tangle provides additional time. Elemental pickups include [Solar]Firesprites, [Void]Void Breaches, [Arc]Ionic Traces, [Stasis]Stasis Shards, and [Strand]Strand Tangles.
Enhanced version
Collecting an Elemental pickup or destroying a Tangle grants this weapon a stacking period of further increased damage. Throwing a Tangle provides additional time. Elemental pickups include [Solar]Firesprites, [Void]Void Breaches, [Arc]Ionic Traces, [Stasis]Stasis Shards, and [Strand]Strand Tangles.