Recall Knowledge - Animal (Nature): DC 14; Unspecific Lore: DC 12 Specific Lore: DC 9
Few everyday vermin inspire as much dread as the infamous spider.
A dream spider's webs have an iridescent hue and are infused with the same hallucinogenic compound as the creature's toxin. Originally denizens of tropical jungles, dream spiders have adapted well to temperate environments, particularly thriving among the rooftops of cities where shady alchemists use their venom to produce the drug known as shiver.

Associated Monsters

Though they are vermin incapable of forming true alliances, spiders show up alongside many types of creatures, including web lurkers. Spellcasters sometimes call upon spiders using summon animal, and spider swarms have a way of popping up just about anywhere at the most inopportune times.

Other Giant Spiders

A staggering number of species of giant spider exist in the world. Some, like the dream spider, whose venom creates strange hallucinations, are relatively small. Others, like the lumbering ogre spider, are larger than horses.

Shiver Addicts

Talented alchemists process dream spider venom into an addictive drug called shiver. Those who become addicted to shiver may be driven in desperation to seek out dream spiders and allow them to bite their flesh in order to get their fix—a tactic that often backfires awfully as the spiders feed.

— Bestiary 2 pg. 249 2.0