Demons - R

Rebellion = A series of dark swords forged in the deepest pits of Hell. Deals extra damage to those who serve the Light. For more info see Rebellion.
Reformed, The Reformed = These Fallen have 'seen the Light' (so to speak) and now actively serve the Light. But they remain Fallen... maybe they've developed a strange theology and places them within God's plan as jailers of hell, or maybe they feel God needs monsters like them to whip humanity into obedience. Or maybe they just want to feel the kick of binding Infernals in order to work against Hell? 
Revenants = Revenant simply means someone who has returned from the dead, but for Infernalists it refers specifically to those dead bodies who are 'resurrected' by being reanimated by a possessing spirit. These cadavers are not truly alive, they are husks being used by the demon within (the original soul is long gone). 
Rippers = See Rippers. 
Rising Darkness = See Rising Darkness. 
Run with the Devil = See Run with the Devil.