Giant spiders have a variety of uses.
When Butchered, you can expertise the venom form the mouth Glands, the Silk form the silk glands, along with spider shell which it's Dark colored chitin, while thin compared to a Beetle chitin, it is still loved by many races for it's Dark Colors.
Before preparing the body one must burn the hairs off of a spider, for they are know to cause rashes to people who touch them.
Even seemly hairless spiders can hold these hair.
After the extraction of the Silk glands, and head, and organs, the abdomen's meat is wonderful for being used in sauce and stocks, adding mild chicken/cod flavor, which goes along good with the lichen of the caverns' and Garlic. This sauce goes well along with Cave goat, Cave muskox, and Giant cave swallow.
The head has some meat like abdomen, but the head is much more valuable for it's potion materials, the brain, eyes, and Venom Glands.
The venom glands can be used by a skilled alchemist to make a Neutralize poison potion, the brain for a potion of Wall walk, and the Eyes for potions of Dark vision, and Potions of false healing.
The legs tend to be the least meaty, but the white, crab like meat is a bitter with a chemical after taste. It is best prepared with butter and Garlic or the Sauce mentioned above.
The Silk can be made into clothes or pressed into paper for common use and for it's use in spell scrolls. Spider silk is prized for its toughness and resistance form ware, making it a popular choice for Gambeson for Cavern residents.