Archdevil

The Archdukes of Baator in 2e

As the Demon Princes are to Tanar'ri and other demons, so too are Archdevils to Baatezu and other devils. These are the demigod-like rulers of the Nine Hells of Baator, or just plain Hell if you're coming from Pathfinder, the commanders of the diabolic legions and the other major contestants for Big Bad Evil Guys for players to defeat.

Because D&D's devils have a certain Abrahamic influence, there are traditionally far fewer of them than there are Demon Princes; in fact, in some sourcebooks, the Archdevils are the same thing as the Archdukes, which means that if you don't count their boss Asmodeus as one of them, there's only ever eight Arch-Devils in total, plus a handful of former Archdukes who have the power but no longer have the authority. Who's who depends on which edition you're looking at. Other editions make it clear that there Archdevils consist of both Archdukes - the layer rulers - and Dukes, which are Archdevils not quite strong enough to have their own layer.

Pathfinder, in comparison, has a much fuller roster of Archdevils; as well as Infernal Dukes like in D&D, there are also the Malebranche - unique and powerful devils strong enough to ravage worlds themselves, essentially a next tier down from the Infernal Dukes, and the Whore Queens - a band of four female fallen angel archdevils who have risen as high as they can in the misogynistic hierarchy of Hell, and whose cults are comparable to those of the Archdukes.

D&D

The Archdukes of Baator

• Level 1, Avernus: Bel or Zariel
• Level 2, Dis: Dispater
• Level 3, Minauros: Mammon
• Level 4, Phlegethos: Belial and Fierna
• Level 5, Stygia: Levistus or Geryon
• Level 6, Malbolge: Moloch then Malagard then Glasya
• Level 7, Maladomini: Baalzebul
• Level 8, Cania: Mephistopheles
• Level 9, Nessus: Asmodeus
• Level ???: Gargauth

Infernal Dukes

In contrast to the above, these Archdevils never were rulers of the nine layers of Baator, but they're still powerful figures in their own right.

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Bael

A powerful vassal of Mammon, who is also known as the Bronze General. Whilst he's a brilliant tactician, politically, he's kind of inept. Nothing pisses him off more than to have his legitimate accomplishments rendered null or stolen by some slimy weakling whose only talent is scheming, so he'll often hire outside adventurers to help compensate for his lack of political acumen.

Hutijin

An ascended pit fiend servant of Mephistopheles renowned for both his loyalty to his master (which makes other devils think Mephistopheles has some big-league blackmail on him) and his hatred for mortals. Unlike most devils, summoning Hutijin just results in a torturous death as he takes out his rage about being taken from Cania on his unlucky summoner. Because of this, other archdevils have taken to liberally handing out Hutijin's personal phone number, resulting in his days often being interrupted with annoying calls he has to take because they yank him to another plane. His rivals do this because first of all, it's hilarious, and secondly, all time Hutijin spends on the Prime Material torturing some hapless berk who called the wrong hell-number is time that Mephistopheles spends without his greatest servant, potentially leaving him vulnerable.

Titivilus

Even the most paranoid of individuals are prone to listening to what they wish to hear; so long as what you're telling them is 'you have enemies everywhere', they might even accept the implicit premise of 'I'm not one of them'. No one knows this better than Titivilus, seneschal to Dispater. While Dispater, unlike many paranoids, really does have people plotting to attack or betray him, Titivilus has stoked his paranoia beyond what is reasonable even by devilish standards, encouraging Dispater to seclude himself completely and leave most of the day-to-day rulership of Dis to Titivilus- a task he's succeeded at so well, some people think he actually is Dispater.

But despite how well his plan has been going, Titivilus is aware that he rests in a very precarious position. All it would take is one slip-up, one inconvenient surprise, or one devil snitching on him for Dispater to notice his schemes and probably either kill him or torture him for eternity. So Titivilus spends a lot of time trying to smooth over rough edges and snip loose threads in his carefully-constructed deception, and often hires adventurers to help him with this, usually either killing some problematic devil or doing the grunt work in getting another of his plans into action.

Pathfinder

The Archdukes of Hell

In Pathfinder, these are the reigning archdevils of Hell.

Barbatos

Named after a minor fiendish noble mentioned a few times throughout the books (which books?), Barbatos is the gatekeeper of hell. He's not a devil or even a fiend: he resembles some kind of hunched being made from barbed tentacle vines. He protects Hell from invasions by angels and demons alike and makes sure that the souls of the damned are ferried to their final fates. Him not being a devil harkens back to the Hag Countess Malagard, who just like Barbatos is from outside of the plane. Except she's a Hag and Barbatos is... well, it's not entirely clear.

Dispater

Dispater and Asmodeus go way back even in Pathfinder. This grants him a favored place in Hell, but he generally keeps out of infernal politics. Instead he focusses on building the perfect society in which everyone, not just the devils, can live. Given that this community is literally made in Hell, this is not a good thing. In a sense he's an ideal king: calm, deliberate and careful, but he's also ruthless, manipulative and unforgiving. Dispater is big on etiquette as well, and violating it is a surefire way to draw his ire. Yet strangely he also values courtly love and marriage, making him unique amongst his fellow Archdevils. Dispater looks like a typical devil: a horned, red-skinned humanoid with flames crowning his head and tipping his tail.

Mammon

The punchline to all "evil bankers" jokes, Mammon is the treasurer of Hell. A fallen angel, Mammon was slain long ago. But instead of passing on his soul jealously clinged to existence and managed to infuse himself into the wealth that surrounded his place of death. Mammon eventually managed to bind himself to these riches, making him one with the treasures of Hell. He meticulously keeps track of Hell's finances and reports them directly to Asmodeus. Mammon can easily possess objects or people of any kind, but his favorite body is a construct called the Argent Prince that looks like an idealized form of his old body, and grants Mammon a buttload of immunities and abilities.

Belial

The Pale Kiss is a creation of Asmodeus himself. Only the Prince of Darkness himself knows exactly what Belial is or where he came from, and Belial does not seem to care. He can take just about any form he wants almost subconsciously, taking whatever form is most desirable for whoever looks at him. This is one of the purposes for which Belial was created: Asmodeus also granted him boundless imagination and creativity in order to create objects of incredible beauty and cruelty. Belial has created everything from art to weapons, magics and even races of servitors, but once he's done with something Belial gets bored and moves on. On top of his creativity Belial is also a creature of boundless lust, and there are innumerable half-fiends out there of every kind who can trace their lineage back to the Pale Kiss.

Geryon

Greatly resembling his D&D counterpart, Geryon is the lord of Stygia. He did not start out as a devil: he was once an Asura rana, one of the greatest accidents of the gods. When Asmodeus came rolling into town he made a deal with the Prince of Darkness, betrayed his fellow Asuras and strengthened the devils' grip on the plane. In return for his services Geryon was made into an Archdevil. He has unrivaled knowledge of impossible religious truth and the gravest heresies, being more or less the librarian of Hell. Geryon looks a lot like his D&D counterpart: a massive devilish humanoid with the lower body of a snake. Except he's three snakes; one red, one yellow and one blue. The yellow one wields a flail, the blue one carries a shield and the red one carries a great horn that twists the perception of whoever hears it. According to Bestiary 6, he's literally the three snakes; each one can simply regurgitate part of any being it's ever eaten and use it to interact.

Moloch

As the general of Hell, it is Moloch's job to lead its armies to victory all across the planes. He does not only commands devils: petitioners, other denizens of Hell and mercenaries who flocked to the banner of Hell all answer to him. Moloch runs a tight ship and suffers no insubordination, punishing transgressors harshly. Those who deliver on his expectations are rewarded accordingly, but he demands constant service. Moloch is a great tactician as well, having studied war in all of its forms for eons to become a true master. Desptie being the master of Malebolge he commands forces on the front lines, much like how Bel does it on Baator. This makes it seem that he and Barbatos have switched places when compared to their D&D kin. Moloch himself kind of looks like Bel as well, except he's combined with Deathwing; a giant burning dude with black metal that's also his skin and fire streaming between the gaps.

Baalzebul

The Lord of the Flies, Baalzebul was once the right hand man of Asmodeus. But he grew too proud, too greedy and this proved his downfall. When he demanded to rule over several layers of Hell instead of just one Asmodeus punished him by unmaking his beautiful angelic form and gave him a hideous one in return, much like how it went down in Baator. In Pathfinder however Baalzebul was turned into a swarm of millions of insects. When combined together these take a humanoid form that can sort of resemble his old body, except it's nowhere near as beautiful. Baalzebul is now plotting to get back what he lost and get revenge on Asmodeus. His arrogance and pettiness is to such a degree that while he favors the longsword he demands that his followers stick to spears instead.

Mephistopheles

Made from the very stuff of Hell itself, Mephistopheles is the ruler of Caina and the greatest master of the infernal contract to walk the planes. He loves to tempt mortals into giving up their souls, often without them realizing it. His favorite weapon is his adamantine quill pen that allows him to whip up a perfect contract in a few seconds. Mephistopheles has great skill at weaseling himself into the good graces of another person, figure out their secrets and force them to tell the truth. The devil himself looks like a classical horned and winged red devil, except he has three sets of wings: a pair of burning ones that can strike to set something on fire, a pair of draconic wings to make a target bleed and a pair of raven wings to make a target permanently go blind.

The Fiends of Pathfinder
Lawful:	Asuras - Devils - Rakshasas - Velstracs
Neutral:	Daemons - Divs - Sahkils
Chaotic:	Demodands - Demons - Lilus - Nindorus - Qlippoth
Any:	Oni
Lords:	Ahriman - Archdevils Demon Lords - Four Horsemen