cold and bludgeoning, piercing, and slashing from nonmagical attacks that aren't silvered
fire and poison
truesight 120 ft.,
passive Perception 10
Infernal and telepathy 120 ft.
20 (25000 XP)
Any creature hostile to the pit fiend that starts its turn within 20 feet of the pit fiend must make a DC 21 Wisdom saving throw, unless the pit fiend is incapacitated. On a failed save, the creature is frightened until the start of its next turn. If a creature’s saving throw is successful, the creature is immune to the pit fiend’s Fear Aura for the next 24 hours.
The pit fiend has advantage on saving throws against spells and other magical effects.
The pit fiend’s weapon attacks are magical.
The pit fiend’s spellcasting ability is Charisma (spell save DC 21). The pit fiend can innately cast the following spells, requiring no material components:
At will: detect magic, fireball
3/day each: hold monster, wall of fire
The pit fiend makes four attacks: one with its bite, one with its claw, one with its mace, and one with its tail.
Bite.Melee Weapon Attack: +14 to hit, reach 5 ft., one target. Hit: 22 (4d6 + 8) piercing damage. The target must succeed on a DC 21 Constitution saving throw or become poisoned. While poisoned in this way, the target can’t regain hit points, and it takes 21 (6d6) poison damage at the start of each of its turns. The poisoned target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
Claw.Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 17 (2d8 + 8) slashing damage.
Mace.Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 15 (2d6 + 8) bludgeoning damage plus 21 (6d6) fire damage.
Tail.Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 24 (3d10 + 8) bludgeoning damage.
Source: 5srd adaptation of Pathfinder Roleplaying Game Bestiary.
Rulers of infernal realms, generals of Hell’s armies, and advisors to the archfiends, pit fiends embody the awesome and terrible pinnacle of devilkind. Massive, physically indomitable, and possessed of ingenious evil intellects, these diabolical tyrants hold great autonomy whether in their service to the archfiends, in their rule of vast infernal fiefdoms, or in subjugation of mortal worlds. Thick muscles cling to their gigantic frames, armored over by dense, bladed scales capable of deflecting all but the most potent assaults. Fangs as thick as daggers fill their maws, bestial visages disguising some of the most insidious minds in Hell. Born within the depths of Nessus, the ninth and deepest layer of Hell, pit fiends are raised from the ranks of cornugons and gelugons by the archdevils and their dukes alone. While many travel to higher layers and far from Hell to command infernal legions, most remain in Nessus serving in the courts of Hell’s elite or in dark councils with unknowable purposes. Pit fiends always stand over 14 feet tall, with wingspans in excess of 20 feet and weights over 1,000 pounds.
Pit fiends are masters of fire and prefer lands bathed in flame. In Hell, this predisposes them to Avernus, Dis, Malebolge, Nessus, and Phlegethon the layers most likely to harbor their burning temple-citadels. Fanatics obsessed with diabolical superiority and ironclad obedience, pit fiends left to their own devices raise massive armies, scouring the pits of Hell for the most depraved lemures to transform into true fiends. When convinced they’ve formed the perfect legions, they turn their attentions to vulnerable demiplanes and mortal worlds, eyeing them for infernal domination and the glory of conquest. While obedient to the hierarchies of their kind, they are also strict in their enforcement, and should a pit fiend find itself subservient to a master unfit to rule, it holds itself duty bound to cast down such an incompetent lord. Thus, whether as masters or servants, pit fiends embody the will of Hell’s merciless law and assure that only the strongest of devilkind flourish (or dare to).
Only the most powerful of mortal spellcasters can or dare summon a pit fiend. These devils’ reactions to summoning are deliberate and swift, usually typified by overwhelming rage that such insignificant beings would waste their immortal time. Those that cannot weather the devils’ burning rage are slain—their souls typically racing the pit fiends back to Hell. Those who manage to keep control of the greater devils though, intrigue them. A pit fiend might dutifully serve a mortal master for centuries, but its goal is always the same: to further corrupt the mortal soul, assure its absolute damnation, and when the mortal inevitably dies, claim its soul and begin the process of creating a perfectly corrupt lemure servant. Pit fiends know they are immortal and are intelligent enough to indulge in impossibly disciplined patience. As such, the eldest pit fiends see in their legions the faces of countless fools who once presumed themselves the devils’ masters.
Source: 5srd adaptation of Pathfinder Chronicles: Princes of Darkness, Book of the Damned Vol. I.
The most blasphemous of offerings can help tempt a pit fiend to service. Giving a powerful good-aligned cleric or noteworthy angel, a significant holy relic, or a powerful tool of evil to a pit fiend targeted by a planar binding spell increases the spell’s DC by 2.