Collective Demolition is a trait in Destiny 2 that can appear on 28 weapons. An enhanced version exists on crafted and some newer weapons.
What Collective Demolition does
Collecting an Elemental pickup or destroying a Tangle grants this weapon a stacking period of grenade energy generation on hit. 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 improved grenade energy generation on hit. Throwing a Tangle provides additional time. Elemental pickups include [Solar]Firesprites, [Void]Void Breaches, [Arc]Ionic Traces, [Stasis]Stasis Shards, and [Strand]Strand Tangles.