Phase Spider

Large monstrosity, unaligned

Armor Class 13 (natural armor)

Hit Points 32 (5d10+5)

Speed 30ft., climb 30ft.

Skills Stealth +6

Senses darkvision 60ft., passive Perception 10

Languages -

Challenge 3 (700 XP)

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.

Actions

Bite

Melee Weapon Attack: +4 to hit, reach 5ft., 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.

A phase spider possesses the magical ability to phase in and out of the Ethereal Plane. It seems to appear out of nowhere and quickly vanishes after attacking. Its movement on the Ethereal Plane before coming back to the Material Plane makes it seem like it can teleport.