Argent Spider, Gargantuan (CR 10)

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

AC: 29 (-4 size, +2 Dex, +21 natural), touch 8, flat-footed 27
Hit Dice: 32d8+64 (208 hp)
Fort +20, Ref +12, Will +10
Speed: 40 ft., climb 20 ft.
Space: 20 ft./15 ft.
Base Attack +24; Grapple +45
Attack: Bite +29 melee
Full Attack: Bite +29 melee
Damage: Bite 2d8+13 plus poison
Special Attacks/Actions: Poison
Abilities: Str 29, Dex 14, Con 14, Int -, Wis 10, Cha 6
Special Qualities: dimension slide, vermin traits
Feats: -
Skills: Climb +17, Hide -6, Jump +19, and Spot +8
Advancement: -
Climate/Terrain: Any
Organization: Solitary
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.