Big Spider

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 it knows the location of any other creature in contact with the same web.

Bite. Melee Attack Roll: +5 to hit , reach 5 ft. Hit: 5(1d4 + 3) Piercing damage plus 2(1d4) Poison damage.
On a hit the target makes a Constitution Saving Throw: DC 10, Failure: The target has the poisoned condition and take 1 Poison damage at the end of each its turns until the poisoned condition is removed.

Web(Recharge 5–6). Dexterity Saving Throw: DC 13, one creature the spider can see within 60 feet. Failure: The target has the restrained condition until the web is destroyed (AC 10; HP 5; Vulnerability to Fire damage; Immunity to Poison and Psychic damage).