Phase Spider

Large monstrosity · CR 3

Armor Class 13

Hit Points 32 (5d10+5)

Speed climb 30 ft., 30 ft.

STR 15 +2

DEX 15 +2

CON 12 +1

INT 6 -2

WIS 10 +0

CHA 6 -2

Skills stealth +6

Senses darkvision60 ft. , passive Perception 10

Traits

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/Ranged Weapon Attack: +4 to hit.: 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.