Argent Spider, Large (CR 5)

Large Vermin
Alignment: Always neutral
Initiative: +2 (Dex); Senses: darkvision 60 ft. and Spot +8

AC: 21 (-1 size, +2 Dex, +10 natural), touch 11, flat-footed 19
Hit Dice: 8d8+16 (52 hp)
Fort +8, Ref +4, Will +2
Speed: 40 ft., climb 20 ft.
Space: 10 ft./5 ft.
Base Attack +6; Grapple +15
Attack: Bite +10 melee
Full Attack: Bite +10 melee
Damage: Bite 1d8+7 plus poison
Special Attacks/Actions: Poison
Abilities: Str 21, Dex 14, Con 14, Int -, Wis 10, Cha 6
Special Qualities: dimension slide, vermin traits
Feats: -
Skills: Climb +13, Hide +2, Jump +15, and Spot +8
Advancement: -
Climate/Terrain: Any
Organization: Solitary, pair, brood (3-5), or colony (5-20)
Treasure: None

Source: Web

Argent spiders resemble normal spiders in form, but they are composed of crystalline materials and metals, and are silvery gray-green in color. It seems as though they have been sculpted into a perverse form of art, but they are living creatures. Nobody can say how this vermin came into being, but it is a fairly common sight on the Demiplane of Ectoplasm.