This one is my personal favorite.
Devil, Chromatic Abishai
Large Outsider (Baatezu, Evil, Extraplanar, Lawful)
Hit Dice: 14d8+70 (133 hp)
Initiative: +6
Speed: 30 ft., fly 50 ft. (poor)
AC: 26 (-1 size, +2 Dex, +15 natural) touch 11, flat-footed 18
Base Attack/Grapple: +14/+25
Attack: Tail sting +21 melee (1d8+7/19-20 and see text)
Full Attack: 5 tail stings +21 melee (1d8+7/19-20 and see text) and 2 claws +18 melee (claw 1d6+3) and bite +18 melee (1d8+3)
Space/Reach: 10 ft./10 ft.
Special Attacks: Poison, spell-like abilities, sting,
summon baatezu
Special Qualities: Damage reduction 10/good, darkvision 60 ft., immunity to fire and poison, regeneration 14, resistance to acid 10 and cold 10, see in darkness, spell resistance 27, telepathy 100 ft.
Saves: Fort +14, Ref +11, Will +11
Abilities: Str 25, Dex 15, Con 21, Int 14, Wis 14, Cha 16
Skills: Bluff +19, Concentration +22, Disguise +20, Escape Artist +19, Intimidate +20, Knowledge (the planes) +19, Listen +19, Search +19, Sense Motive +20, Spot +19
Feats: Combat Reflexes, Improved Critical (tail sting), Improved Initiative, Multiattack, Weapon Focus (tail sting)
Environment: Nine Hells of Baator
Organization: Solitary, flight (2), or wail (1-3 plus 3-12 abishai of random colors)
Challenge Rating: 15
Treasure: Standard
Alignment: Always lawful evil
Advancement: 15-28 HD (Large)
Level Adjustment: -
The creature resembles a gothic gargoyle, standing over 9 feet tall, with batlike wings, vicious claws, and snapping jaws. Its most striking feature, however, is a cluster of five prehensile tails that whip about it's body, each a different color and each ending in a wicked stinger. Its scales are a mosaic of colors, encompassing black, blue, green, red, and white.
Tiamat created the chromatic abishai to be her elite baatezu servants, able to tread in areas where her mightiest dragons simply cannot due to their massive size. Chromatic abishai often lead battalions of "lesser" abishai in the Blood War.
A chromatic abishai stands 9 feet tall and weighs around 550 pounds.
Chromatic abishai speak Infernal, Celestial, and Common.
Combat
A chromatic abishai makes the most of its versatility, noting which creatures seem to resist particular energy types, and uses each of its tails against the target that seems most vulnerable to the additional damage.
A chromatic abishai's natural weapons, as well as any weapons it wields, are treated as evil-aligned and lawful-aligned for the purpose of overcoming damage reduction.
Sting (Ex): Any hit from a chromatic abishai's tail inflicts additional damage as follows, depending on its color: black - 2d4 points of acid damage followed by an additional 1d4 points of damage the subsequent round; blue - 2d6 points of electricity damage; green - poison (see below); red - 2d6 points of fire damage; white - 2d6 points of cold damage.
Poison (Ex): Injury, Fortitude DC 22, initial damage 1d4 Str, secondary damage 1 Str. The save DC is Constitution-based.
Spell-Like Abilities (Sp): At will-
animate dead, charm person (DC 14),
command (DC 14),
desecrate, detect chaos/evil/good/law, disguise self, major image (DC 16),
suggestion (DC 16), and
scare (DC 15). Caster level 14th. The save DCs are Charisma-based.
Summon Baatezu (Sp): Once per day an abishai can attempt to summon 1d6 abishai of a random color (black, blue, green, red, or white) with a 50% chance of success, or another chromatic abishai with a 20% chance of success.
Regeneration (Ex): A chromatic abishai takes normal damage from good-aligned weapons, and from spells or effects with the good descriptor.