"Alzim, now that's a name! Leader of the Alten Mercenary Corps, master tactician, ex-general of the Cadmury Kingdom's forces, slayer of entire brigades, or perhaps most notable is he is a master Weilder. Sadly many of the young do not remember him."
Old man at the local pub
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.