If you wake up in a field of green grass, looking at a woman of flesh and steel. Be glad, you are dead. If you wake up covered in blood and shit, be gladder still. For you are alive and your time is not yet come!
Cowardly maggots! Bow your thrice cursed heads and thank the goddess that you still draw unworthy breath!
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.