Phase Spider

Ethereal Sight. The spider can see 60 feet into the Ethereal Plane while on the Material Plane and vice versa.

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

Web Walker. The spider ignores movement restrictions caused by webs, and the spider knows the location of any other creature in contact with the same web.

Bite. Melee Attack Roll: +5, reach 5 ft. 8 (1d10 + 3) Piercing damage plus 9 (2d8) Poison damage. If this damage reduces the target to 0 Hit Points, the target becomes Stable, and it has the Poisoned condition for 1 hour. While Poisoned, the target also has the Paralyzed condition.

Multiattack. The spider makes two Bite attacks.

Ethereal Jaunt. The spider teleports from the Material Plane to the Ethereal Plane or vice versa.