*[['''Phaeton Pattern Mk.IIIb/c]]''': An older pattern based on the [[Rhino#MkIb_Mars_Pattern| MkIb Mars Pattern Rhino]] chassis, to the point it shares a few of its drawbacks, they originate from Forge World [[Phaeton]] but are produced in many forges across the Imperium. Many have seen battle for hundreds of years and are kept as honoured chapter relics, fielded as needed in a Chapter's armoury. They are noted for their distinct square square section turret which is mounted on the forward hull as opposed to center. They remain the second most commonly fielded pattern, next to the Mk.IVb{{Fn|1d}}