Chaos Reshaped is a trait in Destiny 2 that can appear on 48 weapons. There is also an enhanced version with a stronger effect.
What Chaos Reshaped does
This weapon gains bonus damage while in combat for an extended time. Remaining in combat for even longer rewards a larger damage bonus and periodically heals the wielder.
Enhanced version
This weapon gains bonus damage while in combat for an extended time, activating faster. Remaining in combat for a slightly reduced duration rewards a larger damage bonus and periodically heals the wielder.