Golem, Spiderstone (CR 18)

Large Construct
Alignment: Always neutral evil
Initiative: +6 (Dex)
Languages: Cannot speak

AC: 26 (-1 size, +2 Dex, +15 natural), touch 11, flat-footed 24
Hit Dice: 18d10 (99 hp); DR: 15/adamantine
Fort +11, Ref +8, Will +6
Speed: 50 ft., climb 30 ft.
Space: 10 ft./10 ft.
Base Attack +13; Grapple +13
Attack: 4 slams +23 melee, or web +19 ranged touch
Full Attack: 4 slams +23 melee, or web +19 ranged touch
Damage: Slam 1d8+7
Special Attacks/Actions: Berserk, spit web
Abilities: Str 20, Dex 15, Con -, Int -11, Wis 3, Cha -
Special Qualities: Construct traits, fighting spirit, magic immunity, spider climb, SR 22, webwalking
Feats: Cleave; Dodge; Great Cleave; Improved Initiative; Improved Sunder; Mobility; Power Attack; Spring Attack; Weapon Focus (slam); Weapon Specialization (slam)
Skills: -
Advancement: 18-36 HD (Large)
Climate/Terrain: Any underground
Organization: Solitary
Treasure/Possessions: None

Source: City of the Spider Queen

Berserk (Ex): When a spiderstone golem enters combat, there is a cumulative 1% chance each round that its demon spirit breaks free and goes berserk. The uncontrolled golem goes on a rampage, attacking the nearest living creature or smashing some object smaller than itself if no creature is within reach, then moving on to spread more destruction. A divine spellcaster of a drow deity, if within 60 feet, can try (Diplomacy DC 19) to regain control by speaking firmly and persuasively to the golem. Resting for 1 minute resets the golem's berserk chance to 0%.

Fighting Spirit: A spiderstone golem gains a +4 racial bonus on attack rolls (already figured into the statistics above).

Spit Web (Su): A spiderstone golem can spit forth a web as a ranged touch attack (maximum range 90 feet, range increment 10 feet). A Large or smaller creature hit by this attack is entangled (-2 on attack rolls, -4 penalty to Dexterity, unable to move). An entangled creature attempting to cast a spell must succeed at a Concentration check (DC 15) to do so. An entangled creature can escape with a successful Escape Artist check (DC 26) or burst the web with a Strength check (DC 32). Both are standard actions. Once the golem spits a web, it can't spit another one until 1d4 rounds later.

Construct Traits: A spiderstone golem is immune to mind-affecting effects, poison, sleep, paralysis, stunning, disease, death effects, necromantic effects, and any effect that requires a Fortitude save unless it also works on objects. The creature is not subject to critical hits, subdual damage, ability damage. It cannot heal itself but can be healed through repair. It cannot be raised or resurrected. A spiderstone golem has darkvision (60-foot range).

Magic Immunity (Ex): A spiderstone golem is immune to all spells, spell-like abilities, and supernatural effects except Evocation spells and effects, and divine spells cast by drow divine spellcasters. Against such spells and effects, the golem's spell resistance still applies. Unlike stone golems, a spiderstone golem is not affected by transmute rock to mud or stone to flesh spells.

Spider Climb (Su): A spiderstone golem can move on walls or ceiling's as if under the effect of a spider climb spell, except that it moves at its full normal speed. This ability is always in effect.

Webwalking (Su): Spiderstone golems can move freely through any normal or magical web, as if affected by a freedom of movement spell. They can walk along webs as if on solid ground (no Balance check required).

Feats: A spiderstone golem gains feats as a humanoid with the fighter class.

Spiderstone golems have an innate understanding of combat, and they conduct themselves in melee as if they were trained fighters. A spiderstone golem uses its four fists to pummel opponents and spits webs to entangle spellcasters and archers.