The Caestus Assault Ram was a heavily armoured boarding craft of the Legiones Astartes, purpose-built to smash through the hulls of enemy voidships and fortress walls and disgorge Space Marines directly into the heart of the foe. Its reinforced prow, sheathed in adamantine and driven by powerful magna-melta cutting arrays, allowed it to breach armour that would stop any conventional assault, opening a path for the warriors sealed within.
Designed for the brutal, close-confined fighting of void warfare and planetary strongpoint assaults, the Caestus was fast, resilient, and terrifyingly direct. It weathered withering defensive fire during its approach before ramming home and deploying its cargo of transhuman killers amid the enemy's ranks, where a Legion's boarding parties could work their bloody purpose.
Assault-oriented Legions embraced the craft with particular enthusiasm. The Blood Angels, masters of the sudden aerial and void strike, and the frenzied World Eaters both used the Caestus to hurl their warriors into the closest and most savage fighting imaginable.