Chichimec

Medium (Outsider (Air, Evil, Extraplanar)) CR 21
HP 425 hp, hd27d8+189 AC 39 (+7 Dex, +22 natural), touch 17, flat-fooded 32 Fort +22, Ref +22, Will +17 Speed 5 ft., fly 200 ft. (perfect) Initiative +7 Spot , Listen
Standard attacks BAB +27, Grapple +39
Attacks
Full attack: 2 primary wing buffets +39 (2d6+12) melee, 6 secondary wing buffets +37 (1d6+6) melee, tail slam +37 (1d6+6 plus Chadrain) melee
Special Attacks/Qualities
Spell-like abilities, summon air elemental, Charisma drain
Abomination traits, fast healing 10, SR 33, DR 10/ good and epic, electricity immunity
Skills Diplomacy +14, Hide +37, Intimidate +40, Jump -3, Knowledge (religion) +31, Knowledge (the planes) +31, Listen +34, Move Silently +37, Search +31, Sense Motive +32, Spot +34
Feats Alertness, Dodge, Flyby Attack, Improved Bull Rush, Mobility, Multiattack, Power Attack, Blinding Speed (x 2), Epic Toughness
Str 34 Con 24 Dex 25 Int 12 Wis 14 Cha 30
Alignment Always neutral evil, Environment Any, Organisation Solitary, pair, or flock (6?9)

An chichimec?s natural weapons are treated as epic and evil-aligned for the purpose of overcoming damage reduction.

Spell-Like At will?darkness, telekinesis; 3/day?greater invisibility, control weather, call lightning, lightning bolt, chain lightning, wail of the banshee. Caster level 20th; save DC 20 + spell level. The DC is Charisma-based.
Summon Air Elemental (Sp): Three times per day a chichimec can summon an elder air elemental.
Charisma Drain (Su): This effect permanently reduces a living opponent?s Charisma score by 2 points when the chichimec hits with a tail slam, or 4 points on a critical hit. The chichimec heals 10 points of damage, or 20 on a critical hit, whenever it drains Charisma, gaining any excess as temporary hit points. These temporary hit points last a maximum of 1 hour. The attack allows a fortitude save (DC 33)?on a successful save, only 1 point of Charisma is drained and the chichimec heals 5 points of damage. The DC is Charisma-based.
Abomination Traits: Immune to polymorphing, petrification, and other form-altering attacks; not subject to Energy Drain, ability drain, ability damage, or death from massive damage; immune to mind-affecting effects; fire resistance 20; cold resistance 20; nondetection; true seeing at will; blindsight 500 ft.; telepathy out to 1,000 ft.

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System Reference Document -> Epic Creatures (SRD)