Phase Spider

Source: System Reference Document 5.0
The text on this page is Open Game Content, and is licensed for public use under the terms of the Open Game License v1.0a.

Phase Spider

Large monstrosity, unaligned

Armor Class 13 (natural armor )

Hit Points 32 (5d10+25)

Speed 30 ft.

15 (+2) 15 (+2) 12 (+1) 6 (-2) 10 (+0) 6 (-2)

Skills Stealth +6

Senses darkvision 60 ft., passive Perception 10

Challenge 3 (700 XP)

Ethereal Jaunt. As a bonus action, the spider can magically shift from the Material Plane to the Ethereal Plane, or vice versa.

Spider Climb. The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Web Walker. The spider ignores movement restrictions caused by webbing.


Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 7 (1d10 + 2) piercing damage, and the target must make a DC 11 Constitution saving throw, taking 18 (4d8) poison damage on a failed save, or half as much damage on a successful one. If the poison damage reduces the target to 0 hit points, the target is stable but poisoned for 1 hour, even after regaining hit points, and is paralyzed while poisoned in this way.

Source: Pathfinder Roleplaying Game Bestiary.

Phase spiders are voracious predators from the Ethereal Plane who hunt on the Material Plane. When prey is located, the spider shifts to the Ethereal Plane to prepare an ambush. Against a lone victim, the spider shifts to the Material Plane, bites the victim, then retreats back to the Ethereal Plane to wait for the poison to take effect. Against multiple foes, a phase spider follows these same tactics, and on each round a foe remains in reach at the start of its turn, it repeats this gambit. If no foes are in reach, it moves while ethereal to prepare an attack on an available target, but unless it feels safe in spending an entire round on the Material, it won’t phase back to attack unless it can do so while saving a move action for an escape.

Phase spiders are the natural enemy of another denizen of the Ethereal Plane—the xill. The two races have long fought a bloody war with no real prospect of a resolution anytime soon. Were phase spiders less horrifying and alien in appearance, they might find the allies they need to defeat the sinister xill among other races, but their monstrous forms and often overwhelming hunger make diplomacy difficult.

On the Ethereal Plane, phase spiders can manipulate the raw smoky ether in a manner similar to how a spider manipulates webs. Vast, complex nests of semisolid ether float idly through the eddies of the Ethereal Plane, each supporting numerous phase spiders. The creatures enjoy each other’s company, but have no real concept of family—a newborn phase spider is fully capable of fending for itself and is treated no differently by its parents or siblings than any other.

The typical phase spider is 8 feet long and weighs about 700 pounds.