Large (Outsider (Chaotic, Extraplanar, Evil)) CR 17
HP 216, hd16d8+144 AC 29 (?1 size, +4 Dex, +16 natural), touch 13, flat-fooded 25 Fort +19, Ref +14, Will +14 Speed 40 ft. (8 squares) Initiative +4 Spot , Listen
Standard attacks BAB +16, Grapple +29
Attacks
Full attack: Primary longsword +25/+20/+15/+10 melee (2d6+9/19?20) and 5 longswords +25 melee (2d6+4/19?20) and tail slap +22 melee (4d6+4); or 6 slams +24 melee (1d8+9) and tail slap +22 melee (4d6+4)
Special Attacks/Qualities
Constrict 4d6+13, improved grab, spell-like abilities, summon demon
Damage reduction 10/good and cold iron, darkvision 60 ft., immunity to electricity and poison, resistance to acid 10, cold 10, and fire 10, spell resistance 25, telepathy 100 ft.
Skills Bluff +26, Concentration +28, Diplomacy +30, Disguise +7 (+9 acting), Hide +19, Intimidate +28, Listen +31, Move Silently +23, Search 23, Sense Motive +23, Spellcraft +23 (+25 scrolls), Spot +31, Survival +4 (+6 following tracks), Use Magic Device +26 (+28 scrolls)
Feats Combat Expertise, Combat Reflexes, Multiattack, Multiweapon Fighting, Power Attack, Weapon Focus (longsword)
Str 29 Con 29 Dex 19 Int 18 Wis 18 Cha 24
Alignment Always chaotic evil, Environment A chaotic evil-aligned plane, Organisation Solitary or pair

A marilith usually holds a longsword in each of its six hands and wears many bangles and jewels.
A marilith stands about 9 feet tall and measures about 20 feet from head to tip of tail. It weighs about 4,000 pounds.

Though mariliths thrive on grand strategy and army-level tactics, they love physical combat and never pass up an opportunity to fight. Each of a marilith?s six arms can wield a weapon, and the creature gets an additional three weapon attacks with its primary arm. Mariliths seldom rush headlong into battle, however, preferring to hang back and size up the situation first. They always seek to gain the best possible advantage from the local terrain, obstacles, and any vulnerability or weakness in their opponents.
A marilith?s natural weapons, as well as any weapons it wields, are treated as chaotic-aligned and evil-aligned for the purpose of overcoming damage reduction.
Constrict (Ex): A marilith deals 4d6+13 points of damage with a successful grapple check. The constricted creature must succeed on a DC 27 Fortutude save or lose consciousness for as long as it remains in the coils and for 2d4 rounds thereafter. The save DC is Strength-based.
Improved Grab (Ex): To use this ability, a marilith must hit with its tail slap attack. It can then attempt to start a grapple as a free action without provoking an attack of opportunity. If it succeeds on the grapple check, it can constrict.
Spell-Like Abilities: At will?align weapon, blade barrier (DC 23), magic weapon, project image (DC 23), polymorph, see invisibility, telekinesis (DC 22), greater teleport (self plus 50 pounds of objects only), unholy aura (DC 25). Caster level 16th. The save DCs are Charisma-based.
Summon Demon (Sp): Once per day a marilith can attempt to summon 4d10 dretches, 1d4 hezrou, or one nalfeshnee with a 50% chance of success, or one glabrezu or another marilith with a 20% chance of success. This ability is the equivalent of a 5th-level spell.
True Seeing (Su): Mariliths continuously use this ability, as the spell (caster level 16th).
Skills: Mariliths have a +8 racial bonus on Listen and Spot checks.
Feats: In combination with its natural abilities, a marilith?s Multiweapon Fighting feat allows it to attack with all its arms at no penalty.

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System Reference Document -> List of Creatures (SRD)