Phase Spider

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

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

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

The spider makes two Bite attacks.

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.

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