The Wraith Engine stalks the battlefields of western Immoren shrouded in the impenetrable shadow of death and pain. Ephemeral and elusive, it can become incorporeal at will or hide its presence in a cloud of ectoplasmic smoke. Like a great, necromechanikal specter, the Wraith Engine appears suddenly among its victims, slashing them to ribbons with its scything talons and drawing their souls into the glowing, green furnace of its innards.
Privateer Press have posted a preview of the Cryx Wraith Engine War Engine. From their website: