History of Bomber

Bomber is a Common Class Item armor mod that reduces your grenade cooldown whenever you use your class ability. It goes in an armor mod slot on class items.

Acquisition

Banshee-44 occasionally sells Bomber for 10 Mod Components.

Sources disagree on its introduction: the Destinygamewiki lists it as a Season 8 mod, while light.gg lists it as Season 20.