History of Runneth Over

Runneth Over is an origin trait: reloading near allies overflows the magazine. DualShockers says it stacks up to five times, each stack adding 10% from reserves (max 50%), and calls it exclusive to King's Fall raid weapons such as Defiance of Yasmin, Midha's Reckoning and Qullim's Terminus. The Destiny 2 Wiki lists it as an Enhanced Origin Trait from Season 19 without naming weapons. Disagreement: this wiki's Mirror Imago (Episode: Heresy) page also lists it, so it may have been reused; verify in game.