These giant tarantulas have definitely made themselves at home here. There is a 700x1,100 foot area literally covered with webs, and about 300 spiders inhabit the area. Once in the 8 squares, an encounter check must be made for 2-8 spiders 3 times per day (3 in 6 chance), besides the normal encounter check (if the monster is not stronger than spiders, assume it didn’t come or is trapped). 25% will be near a lair (type C).
If someone becomes trapped in the web in the mid-box, 3-12 spiders will come, 2-I if web is just touched, in 2-5 rounds. If the party attempts to burn the web, it will work, but 5 to 50 will survive, in the center. There are a lot of worthless stone statues here, and a pouch under them (treat as secret door) with a 50gp Lapis Lazuli, 50gp Onyx, 10gp Obsidian, 100gp Jasper, 1,000gp Pearl, and a Potion of Time Travel, 2 hits.