Marilith

A marilith stands about 9 feet tall and measures about 20 feet from head to tip of tail. It weighs about 4,000 pounds.

Marilith
Large outsider (Chaotic, Extraplanar, Evil)
Hit Dice	16d8+144 (216 hp)
Initiative	+4
Speed	40 ft. (8 squares)
Armor class	29 (-1size, +4 Dexterity, +16 natural), touch 13, flat-footed 25
Base Attack/Grapple	+16/+29
Attack	longsword +25 melee (2d6+9/19-20) or slam +24 melee (1d8+9) or tail slap +24 melee (4d6+9)
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)
Space/Reach	10 ft./10 ft.
Special Attacks	Constrict 4d6+13, improved grab, spell-like abilities, summon demon
Special Qualities	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.
Saves	Fort +19, Ref +14, Will +14
Abilities	Strength 29, Dexterity 19, Constitution 29, Intelligence 18, Wisdom 18, Charisma 24
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)
Environment	A chaotic evil-aligned plane
Organization	Solitary or pair
Challenge Rating	17
Treasure	Standard coins; double goods; standard items, plus 1d4 magic weapons
Alignment	Always chaotic evil
Advancement	17-20 HD (Large); 21-48 HD (Huge)
Level Adjustment	–

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.

Combat

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 Fortitude 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.

MARILITH LORE

Originally Posted by Dracomortis of the Wizards Community forums.

On this thread

Characters with ranks in Knowledge (the Planes) can learn more about mariliths. When a character makes a successful skill check, the following lore is revealed, including the information from the lower DCs.

Knowledge (the Planes)
DC	Result
15	This serpentine creature is a type of demon known as a marilith. This result reveals all outsider and tanar’ri traits.
22	In addition to their love of battle, mariliths are blessed with a natural cunning that makes them perfectly suited as generals and tacticians in demonic armies. They typically wield a weapon in each of their six arms, but can also constrict opponents like a snake.
27	Mariliths won’t pass up an opportunity to engage in combat, especially melee, but their uncanny brilliance ensures that they don’t rush into a situation without preparing either. They can use abilities like blade barrier and polymorph to even the playing field to their liking or, if a battle goes badly, they can use greater teleport to escape and return at a later time.