All living things must strive. Nature knows no harmony, only war for the privilege to exist. Maug of the Bitter Spirit, the Albatross God, promises no intervention nor advice to His worshippers, just a silent approval of those of you strong enough to help themselves…
The Book of Salts, Ch. 7, verse 12
A vast, intricate complex of kilns and forges where the low-grade ore from the Thunderhead mines are turned into steel of unsurpassed quality. What are the secrets of the Acibus Foundry?
On a location with numerous webs, and at least one big spider, there is a something inside a cocoon. It is humanoid in shape, still moving. If the heroes free it (not before they kill or drive away the spiders), they meet a ... zombie!
The poor zombie wandered the dungeon alone, and tried to kill a big living creature (= a spider). The spider used the usual treatment, even if this victim did not look tasty. The zombie can be easily killed as any other zombie. It got but several doses of spider-poison, so can be something worth if it is extracted. You can mention to a druid or ranger the fact the spider had no poison anymore.