Lords of Hell
Bel, Lord of the FirstBel is a pit fiend of great power who controls Avernus. He resides in his personal fortress in the center of the Bronze Citadel. As well as being Lord of the First, Bel is a general in the Blood War, although not one of the Dark Eight. He betrayed the former Lord of the First, Zariel, in order to gain his current position. It is rumored by his subordinates that Bel still keeps Zariel prisoner somewhere deep within the Bronze Citadel so that he can absorb her power into himself, increasing his own abilities while slowly reducing her to a mere soul shell.
Bel does not have the support of the other Lords of the Nine, except possibly Asmodeus.
Dispater the Archduke, Lord of the SecondThe Lord of the Second, Dispater, controls the layer of Dis from his Iron Tower. It is unknown what type of devil he is, other than that of an archdevil. He usually appears as a humanoid of supernatural height with dark hair, tiny horns, and resplendent garb. He always holds a rod of great power, his badge of office.
Dispater never takes risks and thus rarely ever leaves his Iron Tower, and then only to the call of Asmodeus. In the politics of Baator, Dispater and Mephistopheles, Lord of the Eighth, are allies and are usually scheming against Baalzebul, Lord of the Seventh.
Mammon the Viscount, Lord of the ThirdMammon, the Lord of the Third, rules over the layer of Minauros. He rules from the center of the city of Minauros, inhabiting a mausoleum-like structure of vast proportions. He is an archdevil who resembles a thirty-foot-long serpent with a human head, arms, and torso. He also wields a harpoon-like spear.
During the Reckoning, a failed rebellion against Asmodeus, Mammon allied with Dispater and Mephistopheles against Asmodeus. When Asmodeus finally proved victorious, Mammon was the first to abase himself before him, gaining the enmity of the other Lords.
Lady Fierna and Archduke Belial, Lord of the FourthFierna and Belial, the Lords of the Fourth, rule the layer of Phlegethos. They reside in the city of Abriymoch in a palace of jagged obsidian built on one lip of the caldera.
Fierna and Belial are archdevils who resemble slightly devilish-looking humanoids. Fierna fights with a blade of fire that she summons at will and Belial, with a mighty ranseur.
Fierna is Belial's daughter. Belial allows her to wear the mantle of leadership in public, but in reality, the two rule the layer of Phlegethos together.
Prince Levistus, Lord of the FifthThe Lord of the Fifth, Levistus, rules over the layer of Stygia.
Asmodeus imprisoned Levistus in ice for a past betrayal. He is frozen deep within an iceberg known as Levistus's Tomb that floats in the middle of the harbor of the city of Tantlin. Asmodeus allows Levistus to telepathically communicate with other devils within a ten-mile radius.
The Hag Countess, Lord of the SixthThe Hag Countess, the Lord of the Sixth, is the ruler of the layer of Malbolge. She is actually not a devil but a supremely powerful night hag from the plane of Hades.
The archdevil Moloch once ruled this layer, but he was cast down when he defied Asmodeus during the Reckoning?the general rebellion that ripped through the Nine Hells ages ago. Most authorities acknowledge that it was the Hag, one of Moloch's most trusted advisors, who counseled Moloch to rebel. The Hag was then set in his place as Lord of the Sixth, and Moloch fled and went into hiding.
The Hag Countess resides in a stronghold that is the core of a mountain-sized boulder which perpetually rolls down the slopes of Malbolge. None of her nobles know exactly where it is or on what path it rolls. When she occasionally visits them in their copper fortresses, the nobles host her, though they rarely know that it is her for her expert disguises.
Baalzebul the Archduke, Lord of the SeventhBaalzebul currently resides in the city of Malagard, a beautiful city still under construction, with perfectly straight boulevards, fountains of delicate yet terrible visage, and towers that reach faultlessly straight into the blood-black sky.
To punish Baalzebul for plotting against him during the failed rebellion known as the Reckoning, Asmodeus transformed Baalzebul's formerly angelic body into a melted, sluglike form. As a result, Baalzebul now only openly plots against Mephistopheles, Lord of the Eighth, but his undying anger still burns for Asmodeus, as does his eternal ambition for the throne of the King of the Nine Hells
Mephistopheles, Lord of the EighthMephistopheles, the Lord of the Eighth, rules over the layer of Cania. He resides in Mephistar, a blue-white citadel fashioned of ice that sits atop a fast-moving glacier called Nargus. The Lord of the Citadel, Mephistopheles, controls the movement of Nargus, sometimes causing it to flow over and obliterate lesser glaciers, as well as large numbers of rival fiendish armies caught unaware in Cania. Mephistopheles is served by gelugon nobles who abide in the warm sanctuary of Mephistar.
Mephistopheles appears as a nine-foot-tall humanoid with hell-red skin, horns, and wings. He prefers to wear dramatic capes of the ultimate blackness and carries a magic ranseur that burns eternally.
Mephistopheles once engineered his own coup, replacing himself with Baron Molikroth. However, Molikroth was just an alias of Mephistopheles, and that duplicity has now ended, as well as the lives of "Molikroth's" co-conspirators.
Mephistopheles failed to unseat Asmodeus during the Hells-wide rebellion known as the Reckoning. His largest rival is Baalzebul, and his court runs thick with plots against the Lord of the Flies.
Asmodeus, King of the Nine Hells, Lord of the Ninth (can also be refered to as Lucifer, Melchiresha, Shaitan, and Satanael)
Asmodeus, the King of the Nine Hells and Lord of the Ninth, is at the very least an archdevil, but he possesses the power of a true deity. He resides in Malsheem, located on the lowest layer of Baator, Nessus. He is rarely ever seen, and only when the elite of the Nine Hells gather in any one of a hundred different audience chambers does Asmodeus make his presence known.
he also has a daughter named Glasya (details for her will come later)
Asmodeus has been challenged many times, most recently during the Reckoning the Hells-wide rebellion that ended unsuccessfully but never has he been defeated.

((extra info on the many name of Asmodeus
'Satan' simply means 'adversary', and is not, strictly speaking, a proper name. All fiends might be called satans. (thats why Satan is not on the list of Titles for Asmodeus)
'Satanael' means 'enemy of God' and is only an applicable name for the Dark Lord if a monotheistic religion is active in your campaign.
'Shaitan' properly refers to an adversarial race of genie-like spirits. However, the word derives from 'Satan' and is a fine title for the Dark Lord.
'Melchiresha' is from the Dead Sea Scrolls and means 'Bad, or Evil King'. The opposite name is 'Melchizedek' (see Genesis 14:18 ), meaning 'Good, or Holy King', and in the same context may be justly used as the name of a Crown Archon.))
(((Now as any dedicated D&Der such as myself would know the Asmodeus is not infact Lucifer but for the sake of having just a little bit of difference I have made them one and the same.....D&D Book of Vile Darkness states the Asmodeus is not Lucifer.)))
((((And Lucifer is a god and thus has alot of power))))