The Unknown in full

Today is a nice showcase of a full army. This is the Unkwnown. Lord Knar was a member of the Death Guard, but he felt their ambitions were too vainglorious and so he left the legion. He wandered off during a battle, slew the crew of a Thunderhawk and flew off in the craft to lead a more humble existence, sewing death and plague wherever he went. Where he goes, he turns humans into plague zombies, and they now inhabit his Thunderhawk and follow him into battle. He visits unknown and under-populated worlds, slowly walking through the streets, cutting apart local defence militias and waiting for them to reanimate as skulking abominations of the Plague God. He refuses to fight alongside other space marines, as he finds them too ambitious. He turns his back on them, fading into a cloud of mist and flies...