The yang and yin team of Connor, the Urban Paladin, and Heather, The Mystic Cleric, is very effective as his pragmatism is balance by her optimism, her enthusiasm and idealism are tempered by his cautious paranoia, his wounds are healed by her, and she is kept alive by his sword. This effectiveness aside, Connor and Heather are not your normal adventurous members of The Church. Nor are they a couple.
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.