Archfiend of Despair

Devil, Haazekthok, Archfiend of Despair, Hell's Firstborn

CR 20 XP: 307,200
LE Gargantuan outsider (devil, evil, extraplanar, lawful)
Init +17; Senses Darkvision 60 ft., see in darkness; Perception +34
AC 40, touch 15, flat-footed 31 (-4 size, +25 natural, +9 Dex)
HP 387 (25d12+225); regeneration 5
Fort +27, Ref +25, Will +17
DR 15/epic and good; Immune electricity and fire; SR 33; Resist acid 10, cold 10
Speed 50 ft.
Melee 2 claws +45 (4d6+24/19-20) bite +42 (6d6+18)
Space 20 ft., Reach 20 ft.
Special Attacks Rage, spell-like abilities, symbol of pain
Spell-Like Abilities At will - blasphemy, darkness, desecrate, detect good, detect chaos, dispel good, dispel chaos, greater teleport (self plus 50 pounds of material), heat metal, telekinesis; 3/day - destruction, harm, implosion, time stop; 1/day - mass hold monster, meteor swarm
Before Combat Despite their dim wits, Hells firstborn are natural killers. They prefer to fly into a rage and tear into their enemies with their razored claws and powerful jaws. If they cannot reach their enemies, they will attempt to hold them in place or do away with them at a distance. They really enjoy getting their foes within range of their painful sigils, as they enjoy the look of agony on a meals face. Most Haazkethoks will fight to the death but aren't unknown to run from a losing battle.
Str 35, Dex 28, Con 29, Int 6, Wis 13, Cha 16
Base Atk +25; CMB +41; CMD 60
Feats Epic Fortitude, Improved Critical (Claw), Improved Initiative, Iron Will, Lightning Reflexes, Multiattack, Power Attack, Superior Initiative, Weapon Focus (Claw)
Skills Acrobatics +19, Diplomacy +5, Intimidate +28, Linguistics +24, Perception +34, Sense Motive +16, Stealth +19
  Racial Modifiers +8 to Perception
Languages They do not speak but understand Abyssal and Infernal.
Environment Nine Hells of Baator
Organization Solitary or pair
Treasure none
See in Darkness (Su) Haazekthoks can see perfectly in darkness of any kind, even that created by a deeper darkness spell.
Rage (Ex) Haazekthoks rage as a 20th level barbarian. Unlike barbarians, they may rage and retain a lawful alignment simultaneously.
Symbol of Pain (Su) Hell's firstborn are creatures that after millenia of existence know how to cause pain. They have supernatural sigils on their back that act just as the spell of the same name (Fort DC 25 negates).
Regeneration (Ex) Hell's firstborn take normal damage only from good-aligned, epic weapons and spells and effects of the good descriptor.
Walking on unusually thin legs is a hulking creature of overwhelming horror. Easily the height of five men or more and covered in a thick, coal-black skin, it gazes down upon you with four unnerving orange eyes. It has two muscular arms with meaty hands covered in countless black hook-like razored claws. On its back appear to be two detached, floating, rigid wings that also seem functionless but also on its back are several infernal glowing sigils that merely looking upon send shock waves of agony through you.
Haazekthoks stand about 25 to 30 feet in height and weigh 5 tons.
Haazekthoks are the primordial creatures of Baators origin, before the angels fell and the Baatezu took over. They are what demons would have been if forged from eternal law instead of chaos. It is said that there were once many breeds of these devils but now all that reminds are the dim-witted creatures that roam the most desolate of Hells planes. They like to feed on the flesh of devils and mortals alike, but devil meet is in higher stock.