Wraith Spider, Small (CR 1/2)

Small Undead
Alignment: Always chaotic evil
Initiative: +2 (Dex); Senses: tremorsense, darkvision 60 ft., Listen +2, and Spot +2

AC: 13 (+1 size, +2 Dex), touch 13, flat-footed 11
Hit Dice: 1d12+3 (9 hp)
Fort +0, Ref +2, Will +0
Speed: 30 ft., climb 20 ft.
Space: 5 ft./5 ft.
Base Attack +0; Grapple -5
Attack: Bite +1 melee
Full Attack: Bite +1 melee
Damage: Bite 1d4-1 plus 1 Strength
Special Attacks/Actions: Strength damage
Abilities: Str 9, Dex 15, Con -, Int 2, Wis 10, Cha 1
Special Qualities: undead traits
Feats: Toughness
Skills: Listen +2 and Spot +2
Advancement: -
Climate/Terrain: Any underground
Organization: Solitary
Treasure/Possessions: None

Source: City of the Spider Queen

Strength Damage (Su): The bite of a Large or smaller wraith spider deals 1 point Strength damage.

Wraith spiders fight much as they did in life, except that they lack spinnerets to produce webs. Their poison glands are also missing, but those have been replaced by negative energy.

Wraith spiders are undead creatures formed from the chitinous husks of monstrous spiders but animated by evil spirits from the realm of Kiaransalee.

A wraith spider appears much like it did in life, except that its eight eyes are hollow sockets through which the empty interior of its shell is dimly visible. A shadowy aura surrounds the creature, congealing to pure blackness around its fangs.