A Grenade Harness is a type of rapid-fire Imperial Grenade Launcher that was mounted on some patterns of Space Marine Terminator Armour during the Great Crusade and Horus Heresy eras.
The Grenade Harness could unleash a quick barrage of Frag Grenades to serve as an anti-personnel weapon that softened up the opposition before the Terminators charged into combat.
- The Horus Heresy: Betrayal at Calth Rulebook (Specialty Game), pg. 19
- The Horus Heresy - Book Eight: Malevolence (Forge World Series) by Neil Wylie and Anuj Malhotra, pg. 207