Spider Climb. The spider can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check. Web Sense. While in contact with a web, the spider knows the exact location of any other creature in contact with the same web. Web Walker. The spider ignores movement restrictions caused by webbing.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 1 piercing damage, and the target must succeed on a DC 14 Constitution saving throw or be paralyzed for end of spider's next turn.
Adult Purple Fang Spider is about size of a dinner plate. They are known from their purple coloring as well as their paralysing poison, that has been in use of drow.