Grenade Chaser

Grenade Chaser is a Season 18 basic weapon trait on Quicksilver Storm, a Rocket Launcher. Landing multiple missile tracers loads a grenade into the weapon. The Alternate Weapon Action switches the weapon into Grenade Launcher mode, so one weapon covers both rockets and grenades.

It is listed only on Quicksilver Storm in the game data, so it is a single-weapon trait. Its practical value is that you can swap between rockets and grenades without changing weapons, so it earns its slot on that weapon.