Chaplain - Deathwatch Service: Deathwatch Chaplains act in a similar role to those of other Chapters by serving as the spiritual leaders of battle-brothers undertaking their Long Vigil with the Deathwatch. However, the challenges facing a Deathwatch Chaplain are unique.The rigours of serving in the Deathwatch can be sorely vexing for Space Marines accustomed to the rigidly ordered life of their own Chapters. Long periods of isolation and privation await them, only punctuated by chaotic, often-desperate combat against wildly diverse enemies. The need to work alongside battle-brothers of other Chapters in the Deathwatch can be challenging in itself, particularly amongst those from Chapters with long-running rivalries and past antagonisms.Most of all, battle-brothers in the Deathwatch are exposed to horrible truths about the true threat of the xenos lurking just beyond the circle of the Emperor's light. They will witness sights that can shake their faith to its very foundations and yet are often asked only to watch and report back on what they have seen.This corrosive poison of seeming impotence and frustration can drive Space Marines to insane acts of self-sacrifice in a hopeless effort to overcome star-spanning evils. A Deathwatch Chaplain must always stand ready to renew a battle-brother's devotion when he falters, and to remind him of his duty and his vows when hope seems lost. On the most difficult missions a Deathwatch Chaplain will lead his battle-brothers personally to ensure that their fervour is directed towards victory even if it comes at the cost of the sacrifice of the entire kill-team.The fierce dedication of a Chaplain to his own Chapter usually makes them unsuitable to become Deathwatch Chaplains, although examples of such broad-minded individuals do exist. More typically, battle-brothers find their calling through apprenticeship to an existing Deathwatch Chaplain who has noted their unflagging zeal in pursuit of the alien. Once a Deathwatch Chaplain takes his vows he will seldom see his old Chapter again, instead giving himself entirely to the Long Vigil and the duties of the Deathwatch.A Deathwatch Chaplain must study extensively during his training. He must know the beliefs and values of a thousand different Chapters and their sometimes contradictory legends of the primarchs by heart. A Deathwatch Chaplain must become a dedicated scholar of the primarchs and of Chapter histories originating at the very dawn of the Imperium.Thus, when a Deathwatch battle-brother stands at the brink of despair or impotent rage, the Chaplain will know the right liturgies and catechisms to speak, and which Chapter heroes or legendary battles of the past to cite that will inspire the warriors of the present.Deathwatch Chaplains also make it their business to know of every potential motivation, conflict and agenda amongst their battle-brothers before battle is joined. Many battle-brothers are amazed by the knowledge of Deathwatch Chaplains, and in some cases that knowledge extends even unto the deepest mysteries known only to the inner circle of Chapter hierarchies.A Deathwatch Chaplain takes no sides and makes no judgments about individual Chapters and their long study grants them a perspective denied to most. Deathwatch Chaplain doctrines hold that all Space Marines are united in their purpose of service to the Emperor and those bound by their vows to the Deathwatch must be united more than most.