Imperial Armour 13: War Machines of the Lost and the Damned (2014), p98 — Chaos Dreadnoughts & Helbrutes

Perhaps the most singular and most disturbing Chaos Dreadnoughts however belong to the Death Guard Legion. These monstrous creations seethe with organic corruption, their hulls blistered with oozing sores and weeping, filth-encrusted wounds and other stigmata of the Plague God, Nurgle. What living nightmare is experienced by the occupant of such a vile and horrific machine is best left unimagined.