reposting it here on page 3:
The fiend lords have an insight bonus to AC – anyone figured that out yet? Comes from Wisdom maybe?
Also, they do not have maximum HP.
Do you like him at huge size? I advanced him according to MM rules and a bit beyond that before making alterations from Serge’s template.
I decided not to make them DvR 0.
Omata
Huge Outsider (Good, Lawful)
Hit Dice: 32d8+288 (432 hp)
Initiative: +11 (+7 Dex, +4 Improved Initiative)
Speed: 40 ft, fly 80 ft (perfect)
AC: 28 (-2 size, +7 Dex, +13 natural), touch 15, flat-footed 21
Attacks: Bite +42 melee
Damage: Bite 1d4+18 and poison
Face/Reach: 15 ft by 15 ft (coiled)/10 ft
Special Attacks: Spells, spell-like abilities, psionics, poison, constrict 4d6+18, summon couatls
Special Qualities: DR 20/+5, telepathy, ethereal jaunt, water breathing, SR X, outsider traits, celestial traits
Saves: Fort +27, Ref +25, Will +27
Abilities: Str 34, Dex 24, Con 28, Int 25, Wis 29, Cha 27
Skills: 480 – at least Concentration +, Knowledge (at least three - note that arcana, history, and nature are favored among couatls, though he might prefer psionics to arcana) +, Listen +, Search +, Sense Motive +, Spellcraft +, Spot +, Tumble +
Feats: 9 – at least Dodge, Flyby Attack, Improved Initiative, Still Spell
Climate/Terrain: Any land and underground (warm forest)
Organization: Solitary, or... (3-6 couatls?)
Challenge Rating: TBD
Treasure: ? (couatls are Standard)
Alignment: Lawful good
Advancement: ---
COMBAT
Like most couatls, Omata is not likely to attack without provocation.
Spells: Omata casts spells as a 20th-level sorcerer, except that he does not need material components. He can also cast spells from the cleric list and from the Air, Good, and Law domains as arcane spells.
Spell-Like Abilities: At will – detect chaos, detect evil, detect good, detect law, detect thoughts, invisibility, plane shift, polymorph self, rainbow pattern; 3/day - prismatic sphere, prismatic spray, and prismatic wall. These abilities are as the spells cast by a Xth-level sorcerer (save DC X + spell level)
Psionics: Omata can manifest any psionic power as a Xth-level psion.
Omata has access to all psionic attack and defense modes.
Poison (Ex): Bite, Fortitude save (DC 35); initial damage 2d4 temporary Strength, secondary damage 4d4 temporary Strength.
Constrict (Ex): Omata deals 4d6+18 points of damage with a successful grapple check against Gargantuan or smaller creatures. Often, Omata uses a stilled and quickened spell against other opponents while constricting a foe.
Summon Couatls (Sp): Once per day, Omata can automatically summon 1d4+2 couatls.
Telepathy (Su): Omata can communicate telepathically with any creature within 90 feet that has an Intelligence score of at least 1. The creature can respond to Omata if it wishes – no common language is needed.
Ethereal Jaunt (Su): This works like the spell as cast by a Xth-level sorcerer.
Water Breathing (Ex): Omata can breathe underwater indefinitely and can freely use his spells, psionics, and other abilities while submerged.
Outsider Traits: Omata has darkvision (60-foot range). He cannot be raised or resurrected.
Celestial Traits: Omata can communicate telepathically with any creature within 100 feet that has a language. He is immune to electricity and petrification attacks, and he has cold resistance 20, acid resistance 20, and fire resistance 20. he receives a +4 racial bonus to Fortitude saves against poison.