Ice Spider

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

While in contact with a web, the spider knows the exact location of any other creature in contact with the same web.

The spider ignores movement restrictions caused by webbing.

Melee Weapon Attack +5 to hit, reach 5 ft., one creature. 7 (1d8 + 3) Piercing damage, and the target must make a DC 11 Constitution saving throw, taking 9 (2d8) 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.

Ranged Weapon Attack +5 to hit, range 30/60 ft., one creature. The target is Restrained by webbing, and takes 1 Cold damage at the start of each of its turns. As an action, the Restrained target can make a DC 12 Strength check, bursting the webbing on a success. The webbing can also be attacked and destroyed (AC 10; hp 5; vulnerability to Fire damage; immunity to poison, and Psychic damage).