Chitine (CR 1)

Small Monstrous Humanoid
Alignment: Usually chaotic evil
Initiative: +1 (Dex)

AC: 16 (+1 size, +1 Dex, +3 webbing armor, +1 buckler), touch 12, flat-footed 14
Hit Dice: 2d8+2 (11 hp)
Fort +1, Ref +4, Will +3
Speed: 30 ft., climb 20 ft.
Space: 5 ft./5 ft.
Base Attack +2; Grapple -7
Attack: 3 short swords +3 melee; or 3 javelins +4 ranged
Full Attack: 3 short swords +3 melee; or 3 javelins +4 ranged
Damage: Short sword 1d6; or javelin 1d6
Special Attacks/Actions: Grappling bonus
Abilities: Str 10, Dex 13, Con 12, Int 12, Wis 11, Cha 7
Special Qualities: Difficult to disarm, sensitive to sunlight
Feats: Multidexterity; Multiweapon Fighting
Skills: Balance +5, Climb +9, Craft (trapmaking) +6, Hide +8, Jump +4, and Move Silently +5
Advancement: By character class
Climate/Terrain: Underground
Organization: Swarm (2-8) or tribe (10-60 plus 2-5 choldrith)
Treasure/Possessions: Standard

Source: Monster Compendium: Monsters of Faerûn

Grappling Bonus (Ex): Sometimes chitines choose to grapple opponents and capture them alive to serve as sacrifices to the spider-goddess Lolth. Their four arms grant them a +4 bonus on grapple checks, giving them equal footing with Medium-size creatures.

Difficult to Disarm (Ex): Because of the hooks in a chitine's palm, the creature gains a +4 bonus on its opposed check when a character tries to disarm it.

Sensitive to Sunlight (Ex): In sunlight or bright magical light (such as a daylight spell), chitines suffer a 1 penalty on attack and damage rolls.

Feats: The chitine's Multidexterity and Multiweapon Fighting feats in combination with its natural racial aptitude for making effective use of its limbs allow it to attack with all its arms at no penalty.

Chitines typically rely on traps and ambushes to help them overcome larger and more powerful creatures, including their hated drow and drider enemies. Frequently they build a normal-looking spider web with a seemingly natural way around it concealing a pit, drop net, or similar trap. They can harden their webbing to produce spikes and edges into their traps, typically dealing 1d6 points of damage each.

Chitines are naturally ambidextrous and can use as many as three weapons at once with no penalties. Weapons, armor, and other objects made from hardened webbing deteriorate after several months if not regularly treated with the oil secreted by chitines' skin. These items are also susceptible to fire: Two rounds of contact with flame ignites the webbing, burning an item away in 2d4 rounds.