These diminutive, hooded attendants cluster around the highest-ranking warriors of the Dark Angels and have long been a mystery to onlookers. What manner of creature lies beneath a Watcher's long robes none can say, not even the other Chapters of the Unforgiven. The nature of the creature under the robes is unknown to even the Battle-Brothers of the Dark Angels. Perhaps the Watchers are simply vat-grown Servitor-constructs of an unusual size and form. Perhaps they are some manner of hitherto unknown xenos creature who were native to the Dark Angels' lost homeworld of Caliban. Perhaps they are something more sinister, a corporeal manifestation of the Unforgiven's collective guilt.