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The Proton Accelerator Gun (also referred to as the Graviton Weapon) first a specialized explosive burst, which generates a 137 fold increase in local gravity. The weapon is large enough that it can be used to destroy entire colonies or installations in a single bast. Due to its several minute lock and reload time, it cannot be targeted against smaller, mobile targets.

The gun was developed at the Warhammer XII weapons development planet in the last days of the Vega Campaign. It was first tested to destroy the same installation, then under the threat of a Terran Confederation invasion. The first production model was mounted onboard the KIS Sivar in the Jakarta system and used in a devestating sneak attack on the Goddard colony.

The attack destroyed every structure on the planet and killed 250,000 colonists. The Terran Confederation assigned Task Force Delta, lead by the Tiger's Claw, to Operation Thor's Hammer - track the enemy battlegroup behind enemy lines and destroy every ship involved in the attack. Following the destruction of the Sivar, the Confederation deployed a fleet of four Bengal strike carriers to destroy the Jakarta system shipyard where the weapon was installed.

The Terran Confederation's Phase Transit Cannon is based on the Proton Accelerator Gun technology, using data gathered from the wreckage of the KIS Sivar.