Giant Spider

Giant Spiders are a type of spider.

Lore
Giant Spiders are a sub-type of spider. While not unique in their size (other spiders in Sanctuary have reached similar proportions), they are unique in their levels of intelligence (though are still basically animalistic). They have earned the moniker of "Evil Spiders" due to their cunning and cruelty These spiders owe their origins to giant spiders in Kehjistan, which were changed by the Prime Evils, causing them to seek meals of the human variety. They slash with their swordlike mandibles (which secrete a virulant poison), delighting in sucking the blood of their prey, and using the carcass as an incubator for their young. They hunt by crawling on the ceiling of man-made structures, spinning and dropping sticky webs on anyone unfortunate enough to be below. They are immune to poison themselves.

In-game
Giant Spiders are encountered in Diablo II. They have four varieties: Arach, Poison Spinner, Flame Spider, and Spider Magus.

Poison Spinners have a 33% chance to deal Poison damage. Flame Spiders have a 40% chance to deal Fire damage. Spider Magi have a 50% chance to deal Poison damage. On Hell difficulty, Arachs, Flame Spiders, and Spider Magi are immune to Fire while Poison Spinners are immune to Poison.

A superunique Giant Spider is Sszark the Burning.

Development
There is an unused animated graphic named "spider_goo_neutral". There is no projectile connected with it which suggests that Giant Spiders were planned to leave pools of caustic acid upon death like the Spitting Terrors from Diablo I. There is an unused monster missile property named Acid which would destroy the armor class and durability of items, it's plausible that this goo would work like that.