Devils

:"Devils are the world's warning to you, Brothers, of what will happen if you allow your duty to consume the greatness of your soul. They long ago took up arms against the enemies of creation, but in fighting the demons back, they sadly became more like them: twisted evil reflections of the angels they once had been.
:"Some have asked, why did St. Pelor not intervene to save his children from the darkness. But darkness cannot be cleansed from outside. That is a journey which must finish within, and the devils had no wish to repent for their sins. So it was they become something else, something sinister and vile to prey on the mistakes of good men, twisting us into new, weaker version of them.
:"But for devils, atoning for sins would be a simple matter of apologies and forgiveness. But for devils, fewer people would fall irrevocably to evil. But oppose them not with hatred, for that is their greatest weapon. When you strike them down, do so with pity in your heart. That fiend was likely once like you, tricked into evil acts, and consumed by his guilt. So never hate him, for that thought may be your downfall, and someday you may find yourself slain at the hands of a brother, and curse the day you thought so rashly."
~Aldaberto Rubio Bolivar, Knight Captain of the Order the Golden Finch
Devils are a powerful race of extraplanar immortals. What is known about them largely comes from religious texts, but they seem to have appointed themselves both salesmen of evil, and harsh enforcers of justice. They are timeless, patient and arrogant, willing to wait millennia to get what they want, long after mortals opposing them are dead and gone.
Everything devils do is to extend their own power, via the acquisition of souls to power their infernal economy. Individual devils often work against each other toward the same goal, but they are not stupid, and incredibly long-sighted. They work together when it benefits them to do so, which is more often than most mortals would like. Currently, the devils have lost a foothold in the north of the Plains, but don't seem to be up to much beyond their usual trickery and deception.
Fiendish Taint
When a mortal commits an act of evil, devils lay claim to their soul. This appears to be endemic to their nature, something that just happens. Of course, a mortal can atone for that sin before death, or find other ways to safeguard his soul. And the Devil's know this.
It seems they have done something in the Dark Plain to ensure that all souls go to them unless otherwise cleansed or claimed. This results in anyone resurrected after death in the Plains suffering infernal taint on their soul, clearly visible to those who know where to look, and sometimes granting powerful, tainted abilities, that should be used with the greatest of caution.
The Nine Hells
A vast plane of nine levels ruled by archdukes, Pit Fiends of vast power. The Nine Hells teem with devils forcing those lower down to do the industrious work of processing souls and accruing power.
The Legion Devils
Huge armies, containing millions of war-hardened devils, veterans of millennia of warfare. They are possibly the single best fighting force on the planes, adept at fighting all manor of foes. They are, however, coldly logically, and will not fight when there is nothing to gain, or the risk is too high.
==Types of Devil==
So far several types of devil have been identified, though exactly how each comes into being is not exactly clear
Lemure
Twisted abominations made from mortal souls, these beings are resentful of all who still enjoy the life they once had. They viciously attack anything living, unless called off by more powerful devils.
Imp
Imps are tiny bat-winged creatures that spread lies and deceit everywhere they go. Usually serving other devils, imps are messengers and occasionally familiars to fiendish spellcasters.
Legion Devil
The footsoldiers in all wars the devils fight are the Legion Devils. They are tough and disciplined, making worthy foes.
Erinyes and Succubi
There is some confusion as to whether these two are related or not. Some claim that succubi are in fact demons, and that any claims to the contrary are cases of mistaken identity, confusing succubi with erinyes, similar beings of infernal origin. 
Appearing as beautiful women, and sometimes men, both will use their wiles to lure mortals into committing unspeakable acts.
Ice Devil (Gelugon)
Giant insectoid monsters with command over ice and cold, these fiends are keen strategists, and armies of devils rarely march wihout them in command.
Chain Devil (Kyton)
Tall humanoids covered in chains that seem to be alive, these devils are used to tie up enemy forces while weaker fiends achieve objectives.
Horned Devil (Malebranche)
Also known as War Devils, these vast winged scaly monsters wield huge weapons, and act as shock troops. They will only obey pit fiends, and archdevils.
Pit Fiends
Lords of whole areas of Hell, these beings are immensely powerful, commanding through fear and intimidation.
Archdevils
Archdevils are rarely seen, though other devils may speak of them. It appears they command whole levels of Hell, and so wield unimaginable power.
==Relationships==
The Crimson Templars
A sect of devil worshipping priests