Willing Vessel is an origin trait in Destiny 2 that can appear on 20 weapons. An enhanced version exists on crafted and some newer weapons.
What Willing Vessel does
Dealing damage or defeating targets with this weapon gradually grants increased stability, handling, reload speed, and charge rate. This effect gradually decreases over time but is gained more quickly while near allies.
Enhanced version
Dealing damage or defeating targets with this weapon gradually grants improved stability, handling, reload speed, and charge rate. This effect gradually decreases over time but is gained more quickly while near allies.