The Strange Bestiary
Night spiders originate in Ardeyn's Night Vault, where the 5-foot (2 m) diameter adults (not including legs) nest along the Roads of Sorrow. Night spiders prefer to walk on floors and ceilings, and when they attach themselves to tunnel ceilings with webbing, their dangling legs can be mistaken for rootlets of the Daylands that have breached the vault.
Night spiders are particularly hardy if removed from their home recursion, which means that even if taken into a recursion (by inapposite gate or similar means) that doesn't operate under the law of Magic, their abilities don't see much degradation, especially if they hatched from eggs previously transferred to the new recursion.
Motive: Hungers for flesh
Environment (Ardeyn | Magic): Underground areas in groups of one to six
Health: 16
Damage Inflicted: Moderate wound (4 points)
Movement: Short
Modifications: Attacks as level 5; perception as level 6; Speed defense as level 3 due to size.
Combat: A night spider can bite a foe with its mandibles but prefers to use web strands to attack a target within short range. The webbing inflicts no damage but is amazingly sticky. A webbed character who fails a Might defense roll is dragged within immediate range of the spider (possibly hoisted up into the air if the night spider is attached to a wall or ceiling). The night spider attacks only one foe at a time, and only creatures of about human size or smaller.
Breaking free from a web strand is a level 4 Might-based task. A strand can also be severed if it takes 8 points of damage. Victims unable to break free from the web are automatically cocooned one round after being dragged into immediate range by the spider's spare legs, which hold a victim immobile (allowing only purely mental actions or escape attempts). Each round the victim remains cocooned, he automatically takes 4 points of ambient damage from suffocation. Breaking free from a cocoon is a difficulty 6 Might-based task, and a cocoon can be opened if it takes 25 points of damage.
If a night spider is killed, a mass of tiny spiderling eggs in its internal cavity convulsively hatch. Spiderlings rush out in an unstoppable swarm, and before they disperse, they inflict a moderate wound (4 points) to all creatures in immediate range who fail a Speed defense roll.
Interaction: A guard colony of night spiders can sometimes be established if a handful of eggs are transplanted to an area before they hatch. Adult night spiders are not particularly discriminating in their prey, but they can be trained to ignore certain individuals.
Use: A clutch of night spiders guards the vault of a recursor on Earth that the PCs have reason to investigate.
Loot: The bodies of cocooned night spider victims have normal gear for the recursion in which they're found, which sometimes includes a cypher.
GM Intrusion: The character's weapon or other held item is struck by a strand of web and yanked out of her hand. The item is drawn to the lurking spider before the character realizes what's happened. The spider cocoons the item as if it were living prey.
Core Rulebook