Graviton weapons

Graviton weapons (not to be confused with Grav-Weaponry) are weapons wielded by Space Marines during the Horus Heresy and to a lesser extent during the 41st millennium. They are mostly used in boarding actions, where the explosive ammunition of bolters and other weapons would be dangerous to the weapon's user.

They come in man-portable size (the graviton gun) and vehicle-mounted size (the graviton cannon), but the only difference is range (18" vs. 36") and blast size (3" vs. 5"). They have the Concussion and Haywire special rules, but rather than having a strength, targets are forced to roll a d6, hoping to roll under or equal to their Strength (while avoiding a 6, which always fails). The region hit by a graviton weapon remains dangerous and difficult terrain for the following turn due to graviton flux.

History

The graviton gun was released in Imperial Armour Volume Nine: The Badab War Part One. Why Games Workshop gave the Space Marines yet another kind of graviton toy in their new codex is beyond us.