Nack spiders

The Nack-spiders who live in the spider chambers of the Undermarsh are white and cat-sized, the primary small predators in this area of the Underdeeps and (as noted in the adventure The Elves are Gone) a creature that sometimes accidentally escapes to the surface world. They hunt the many side passages in the root tunnels and accumulate old weapons and other shiny objects in their nests. The Nackers are fond of these spiders and view them as pets. If a Nacker uses an animal summoning spell in combat, Nack-spiders are the creature most likely to appear.