Geryon

Geryon was an archdevil in the Nine Hells, before being ousted from his position as ruler of Stygia. Later, Geryon returned, and sought to reclaim his layer from Levistus.

Description
Although Geryon typically stood tall, his serpentine body stretched to  in terms of length and ended in a venom-dripping barb. His humanoid torso was muscular, with massive, bat-like wings protruding from his back, and his large, bestial arms ended in clawed hands similar to paws. Despite his mismatched bodily structure, the Wild Beast had a kind of raw, animalistic presence that made him weirdly alluring and his head boasted a strangely handsome visage.

Sometimes he took the form of smaller beings to make movement easier, preferring the shapes of monsters like ogres and minotaurs or beasts like tigers.

Personality
Geryon was a brooding being who enjoyed coiling up amongst his treasures and, like a dragon, kept them in a massive hoard. He was also incessant and jealous, persistently pursuing his objectives whether they were his quarry or his former authority. While other devils commanded their fiendish forces from a distance, Geryon was vicious and bloodthirsty, preferring to crush enemies with his own two hands. Although useful in the Stygian wastelands, his bestial savagery was also a weakness that negatively impacted his ability to garner souls and forge proper hierarchies. Despite his barbaric nature and his "Lord of the Filth" title, a mocking play on words similar to Baalzebul's "Lord of the Lies" epithet, Geryon was ironically immaculate and preferred a clean environment, leading some to believe he was slightly insane.

Powers
Even when diminished in strength, Geryon was a terrifying combatant able to rip mortals apart with only his favored weapon, his claws. He used them not only to rip his enemies to shreds, but to restrain them before injecting them with the vitality-stealing venom present in his stinger, a favorite tactic of his. The former lord of Stygia was immune to the cold and naturally regenerated from most injuries at a frightening rate, but his recovery would be temporarily halted if he was hit with blessed weapons, holy power or radiant energy. His gaze could strike terror in his enemies and he was delighted by the sight of his enemies cowering before him, whether a natural response or not.

Despite his brutish appearance and typical demeanor, Geryon was still capable of acting tactically, rivaling Zariel in his reputation for martial skill. Weakening foes from afar before closing in for the kill was one of his preferred methods of fighting and he had a wide range of spell-like abilities allowing him to bewitch his foes, take on other forms, manipulate the cold, create a symbol of pain, pronounce an unholy word, teleport and even grant the wishes of others. He was known to summon gelugons but could also call upon barbazus, hamatulas, osyluths and pit fiends. He would begrudgingly use weapons if necessary, although he had a tendency to lose his composure and descend into an animalistic frenzy when seriously injured, crushing his foes beneath his fists rather than using any kind of plan.

Possessions
Geryon's iconic item was his Horn of the Bull, a powerful magical artifact he always kept close that acted as both a dangerous weapon and a symbol of his dominion. Claimed during a quest for Asmodeus from some gargantuan monster, the horn was banded in iron and most creatures that tried to use it had to use both hands. When blown into, the huge horn summoned up to 20 minotaurs to do the bidding of the wielder, although reports on how often it could be used varied between once per day and once per week. The minotaurs summoned served until death but disappeared the next time the horn was used. The exact nature of the summoned monsters was questionable, with some sources claiming that they were stolen from Baphomet and enslaved while others stated they weren't minotaurs at all but rather a breed of extinct devils that happened to resemble minotaurs. Regardless, Geryon typically used the horn before charging with his summoned monsters at his weakened foes, although it, like its master, suffered a serious reduction in potency after Geryon was deposed.

Geryon was also known to possess two enchanted armaments for situations where weaponry was needed. The first was a sentient battle-axe known as Sever, a weapon forged in the Nine Hells that electrocuted those tainted by good or chaos that tried to wield it. The wicked sharp blade, could communicate either verbally or telepathically and could detect secret traps and passages. The second was a shield named Tonguelash that depicted a giant, devilish face on its surface. It wasn't sentient like Sever, but the mouth area housed a red tongue that would quickly lash out like a whip at the wielder's command, potentially paralyzing the target for a short amount of time, and could let loose a fear-inspiring roar to terrify its wielder's foes once a week.

Realm
Geryon's primary residence was Stygia, the untamed fifth layer of Hell and one dominated by frigid oceans and ice floes. During his rule, monuments were made in his honor like the Pillar of Geryon that floated along the River Styx on the iceberg Elgarz. The granite outline, similar to a cave painting, showed Geryon cutting off right hands and replacing them with powerful, fiendish versions, requiring the wielder to commit evil and lawful acts to retain their power.

Originally he ruled the layer from the city of Tantlin, that had been built from one of the largest and most central icebergs in Stygia. After his exile however, Geryon was forced to abandon the seat of his power that beforehand he almost never left, although he had recently managed to reclaim one of his oldest dwellings, the Citadel Coldsteel. Geryon secretly constructed the fortress by hollowing out an iceberg deep within Stygia and it was often compared to a surgeon's scalpel due to its almost clinical sterility and dangerous nature. The majority of the fortress was unpleasantly cold to most devils and lethally so to most mortals staying for extended periods of time, although the bottommost layer was oddly warmer as it went so deep that it was halfway between Stygia and Malbolge.

The mile around Geryon's lair was filled with the sounds of howling, either from creatures or simply the chilling winds, and portals seeming to lead to safety occasionally appeared only to put travelers somewhere else in Stygia. Within his lair itself he had the ability to banish and restrain those before him and cause bursts of arctic energy to shoot out from the ground.

Appearances

 * Elminster in Hell