These arent exactly deities but there worshiped as them and have the ability to grant spells. These are arch fiends Demon Lords and Dukes of hell a list here follows More information in the book of vile darkness Note some of these domains dont exist and could perhaps be replaced.
Demon lords are at physical wars with eachother They are to chaotic so all these demon lords are self appointed titles they get for basically wooping the most ass in the abyss.
Demogorgon calls himself Prince of Demons alignment Chaotic evil-Demogoron is a two headed insane demon lord with split personalitys. Most cultists of him are often insane psychopaths. Domains Evil Demonic and corruption.
Grazzt-prince of darkness Chaotic Evil-Grazzt is a powerful demon lord who uses charm and cunning unlike most demons and is skilled in magics as hes consorted with many evil witches. He enjoys sacrifices. most preists animate the dead they sacrifice into shadows that guard there temple. The highest ranking cleric (called a chosen.) Is always female. People who worship him often use a wavy blade of some sort. His domains are demonic darkness and evil.
Orcus Demon prince of the undead. alignment Ce Orcus is a dead demon lored who has returned to life. He despises all things but himself preists often wear skull masks and maces with a skull as its head. Orcus demands sacrifice preists of him are called skulls the high preists are called skull lords when a high preist gets enough power he calls himself skull king or queen. Churches are often decorate with bones an skull s. Vampires and liches often worship him and many necromancers.
Domains Chaos.evil Death
Archdevils all alignments are LE first and sixth layer have no worshipers at all They are at political war with eachother and more organized then demons so there not killing eachother off rather using politics to manipulate to there advantage.
Dispater Lord of the second Layer His churches are often well defended fortresses and like the iron Duke the chuch members always have escape routes in there fortress. they favor an iron mace as there weapon as Iron is important to the duke and those who follow him. Preists of Dispater are often very defensive and would never allow themselves to be backed into a corner.
DOMAINS Diabolic evil and war
Mammon lord of the third layer Hes a power hungry schemer covered in riches. CUltists worship him as god of greed and Lust therefore his cultists are also selfish and cruel. Alters to him are always completly covered in gold and jewls those who sacrificed to him are often sacrificed by a blade of pure gold.Cultists often are covered in fancy jewlert abd get there money from wherever they can.
Domains Diabolic evil and greed
Beliall lord of the fourth-His daughter Fierna technacly rules the fourth layer by standerds however Belial really tells her what to say when it comes to politics Fierna just uses her title to attract other devil males. People worship him as a patron of dominance trickery and secrets sometimes preists use the ranseur. Churches to him are often with marble halls and very elogant and there alters have black abd red candles and yes he demands sacrifice. Domains Trickery, knowledge and evil LevistusLord of fith-Killed the Wife of Asmodeouse(badass ruler of hell a bad mistake of Levistus.) So Asmodeose sealed him in a block of Ice. Levistus still rules his layer of hell but is imprisoned in a block of ice his clerics favor the rapier as Levistus won many battles with it. THey view him as a god of Vengence and Betrayal. Part of respect to him is getting a cauldron and placing boiling water in the cauldron then dumping blocks of ice and melting the ice blocks.
Domains evil Diabolic and trickery
Lord of 7 Baalzebul-was once a archon but wanted more then celestia offered so he left and went all the way to hell where he had a new form asmodeuouse liked him at first then he lost his favor and turned him into a A higeouse slug He demands living sacrifice among his cultists and often his churches have a foul odor to respect his accursed form Often Bugbears worship him
Domains Diabolic Trickery and war domains
Mephisopheles lord of the eighth layer (yes this is the devil from Hordes of the underdark whos really badass.)-ruler of cania and inventor of hellfire most of his preist use hellfire. most churches are devorted with fire and have this set up where you can place a sacrifice into a pit in which you turn it on and burn the people you wish to sacrifice alive. Devil worshipers and those fond of fire worship him. Curently Mephistopheles wants to be the true Duke of hell.
Domains Diabolic evil and fire
LAST BUT NOT LEAST ASMODEOUSE LORD OF NINETH AND TRUE LORD OF HELL-He is worshiped more then all the other devils combined. people worship him as a sign of might and oppression they think worshipping him will be ways to gain geat unatinable power his preists often use maces
DomainsDiabolic Evil and Law