SRD
Web Walker. The spider ignores movement restrictions caused by webbing.
Spider Climb. The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.
Darkvision 30ft, Perc 10
Web Sense. While in contact with a web, the spider knows the exact location of any other creature in contact with the same web.
Bite. Melee Weapon Attack: 1d20+4 to hit, reach 5 ft., one creature. Hit: 1 piercing damage, and the target must succeed on a DC 9 Constitution saving throw or take 2 1d4 poison damage.