Watch Master
Watch Masters are the senior officers of the Deathwatch. They are akin to Chapter Masters, although this position in power is shared by the Watch Captain, Chaplain or Chief Librarian.
The foremost xenos hunters in the galaxy, they tested their mettle against hundreds of species of aliens over centuries of conflict. So respected is their knowledge on all things alien that they are known to brief the High Lords of Terra on xenos. Though most members of the Deathwatch eventually return to their original Chapter, Watch Masters are so vital that they are usually never allowed to leave their post. All too often, they shoulder their duties alone, seeking solace of pure throughout in long periods of introspection and solitude.
With their innate understanding of tactics and strategy, they assess the unclean enemy hordes in an instant, picking out weaknesses and directing their Kill Teams with clipped, precise orders. Not content to merely lead from the back, the Watch Master is a true member of the Deathwatch, his guardian spear launching volleys of bolts designed to annihilate specific targets with ease.
On the field of battle, Watch Masters wield xenos artifacts and a Guardian Spear, famed weapon of the Adeptus Custodes. Meaning they are the only non-Custodes capable of wielding Custodes equipment (But what about the Blood Ravens? BLAM! We do not talk about the bloody magpies...) Additional wargear includes a Clavis and Artificer Armour. They are allowed such semi-heretical toys because of Astartes privilege and because they are the Deathwatch and they can do whatever the fuck they want.