Spiders have eight legs and eight eyes. They usually fit into two categories: web-spinners, which have bulbous abdomens and thin, sleek legs; and hunting spiders, which have smaller bodies, larger heads and fangs, and hairy bodies and legs.

Most giant spiders are simply much bigger versions of the web-spinning large spiders. Their poison is Type F, which causes immediate death if the victim fails the saving throw. 

Giant spiders are web-spinners that build strong, sticky webs, and often lurk nearby waiting for victims to get stuck while examining the beautiful constructions of their own spinning. A being with Strength 19 or more is unaffected by the webs. For each point of Strength less than 19, it takes one round to break free of the webs (for example, a PC with Strength 15 can break free in four rounds). As many spiders as possible will attack the defenseless victim during its struggle to free itself. Entangled characters can be attacked with a +4 bonus to hit, and lose all Armor Class adjustments due to Dexterity.