From the release:
Armed with twin-linked Lastrum bolt cannon and Arachnus blaze cannon, the Coronus Grav-carrier is perhaps one of the most recognised vehicles used exclusively by the Legio Custodes. This heavily protected transport skimmer provides them with a degree of speed and agility unmatched by the grinding armour of others who fight in the name of the Emperor, allowing the Legio Custodes to deploy rapidly into a range of terrain whilst reducing the risk of being pinned down by enemy forces.
Principally used as a transport, the strikingly-designed Legio Custodes Coronus Grav-carrier served as the technological basis for the Pallas and Caladius grav-craft. While its primary function is transporting a unit of warriors into battle, its armaments – hull-mounted Lastrum bolt cannon and turret-mounted Arachnus blaze cannon – ensure that it is more than capable of mounting appropriately aggressive defenses.