Phase Spider

Large monstrosity, unaligned

Armor Class 13 (natural armor)

Hit Points 32 (5d10+5)

Speed 30 ft., climb 30 ft.

STR	DEX	CON	INT	WIS	CHA
15 (+2)	15 (+2)	12 (+1)	6 (-2)	10 (+0)	6 (-2)

Skills Stealth +6

Senses darkvision 60 ft., passive Perception 10

Languages -

Challenge 3 (700 XP)

Ethereal Jaunt. As a bonus action, the spider can magically shift from the material to ethereal.

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 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.

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