Chaplain
In the Warhammer 40K universe, a Chaplain is a basically a Space Marine version of the Ecclesiastical priest, but with guns and power armor.
Chaplains were originally formed by Lorgar as part of the religious slant he brought to the Word Bearers, charging them with spreading the cult of the Lectitio Divinatus, his early form of Emperor-worship. After assuming control of the Council of Terra, Malcador the Sigillite instructed the Space Marine Legions to employ Chaplains to enforce the Decree of Nikea, the Emperor's restrictions on Librarians, as a sort of proto-Commissar.
In the present, a Chaplain's role in a chapter is to root out heresy, inspire other Marines by chanting a litany of verses, and basically make the Marines around him righteously angry. Unlike other Imperial officers, he isn't keen on executing his own men for simple cowardice, mainly because Space Marines only retreat to gain a better tactical advantage and the fact that a Marine is more expensive to create than an expendable guardsman; but he does still torture/kill xenos, mutants and heretics for tactical, religious, or recreational purposes. Chaplains are an HQ unit and use a Crozius Arcanum. It is their badge of office/fuckhueg mace capable of ignoring armor and utterly shattering your head right off of your shoulders in a single swipe, while looking totally sweet in his black power armour and skull visage helmet, while scaring the living shit out of the enemy. Higher ranked Chaplains may instead take artificer or Terminator armor. Outside of the company Chaplains, you have the Master of Sanctity or High Chaplain, who oversees the Chapter Chaplaincy and is a senior advisor to the Chapter Master, and the Reclusiarch, who oversees the Reclusiam, where the Chapter's sacred relics and trophies are displayed. Often times the two posts are combined.
For all intents and purposes, just imagine a Space Marine, but even more fanatical and badass. He also has great oratorical skills to make his brothers stop bitching and to pick up his knife then charge that Bloodthirster and stab him right in the balls because godsdamnit that's how you make the Emprah proud. It is also suggested that Chaplains use their "oratory" skills for other purposes as well, but these may just be rumours spread to question the MANLINESS of the Spess Mehreens.
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Now in Dreadnought form.
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I SERVE THE EMPRAH!!!!!
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PRAISE THE EMPEROR AND PASS THE AMMUNITION!
