Plenty of webs can be found at the Spider Cave, in the southeastern part of the Valley of Eodon. They are a nuisance because party members can get stuck in them, preventing them from acting for several turns and making them vulnerable to enemy attacks during combat. Webs can be burned using either torches or fire from a bucket of tar. Perhaps grenades might work as well, although I have yet to try them.
Myrmidex cave entrance
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