This Sons of Horus Arquitor Bombard with Graviton-Charge Cannon was on display at Warhammer World.
The Legion Arquitor is a heavy artillery platform designed to operate at the forefront of a Legiones Astartes advance. Equipped with a reinforced chassis and brutal short range firepower, it is called upon to break the most stubborn of fortifications or to annihilate massed enemy infantry and armour. The graviton-charge cannon fires energised canisters that impact among the enemy ranks, emitting a graviton field that crushes delicate circuitry and electronics, disrupting the advance of anything that survives the barrage.