1. Ossuary (EL 5)
A low, dry-mortared building squats against the west side of the spire. The single-story structure is obviously quite old, but does not share the quality stonework of the tower. A single dark opening provides access on the building's western side.
The ossuary was a broken-down empty shell until Gulthias's return.
A glance into the shadowed interior reveals several humanoid forms (a total of fourteen, if anyone specifically counts them) lying facedown in the loose earth, as well as two coyotes, three vultures, and numerous small vermin. A sharp charnel reek strongly hints at the truth: These forms lie so still because they are dead. The scent is accompanied by a dim melody, impossible to place, that haunts the ossuary's interior. Moving even one step into the building brings the melody into sharper focus for a listener, revealing it as a threat.
Trap: Insidious growth, called blightvine, grows like ivy along the ground and on the walls. Blightvine emanates a wordless music that puts any living creature that hears it (and fails its save) into a deep sleep. Blightvine appeared in the ossuary soon after Gulthias returned to Nightfang Spire, and was likely planted by him to dissuade the curious. When victims are overcome, a rootlike tuber grows up through the soil and parasitically attaches to its new host. Sleeping victims lose 10% of their total hit points each hour unless they are torn loose or the blightvine is destroyed. A patch of blightvine is easily destroyed with 1d4 rounds of energetic hoeing (daggers do in a pinch). If a blightvine cutting is removed from the ossuary, it ceases to exhibit its "musical" abilities.
Blightvine Music: CR 5; music causes all creatures in a 10-ft. radius to fall into unwakable sleep while in radius of effect; Will save (DC 20) each round to avoid effect; Search check (DC 25) to notice something strange about the vines from a distance; Disable Device (n/a).
Development: The oldest body has been dead seven to nine months, and a few are relatively recent. Unless the DM has more involved plans, PCs may discover one or more of the "missing" people noted under Character Hooks here, or even a foe (or the cohort or follower of a foe) the PCs have been trailing (also from Character Hooks).
Treasure: The bodies lie where they fell. One figure, a recently dead elf of wild appearance, possesses ten +1 arrows, a cloak of elvenkind, and 23 pp and 10 gp in a small pouch. The pouch holds a folded parchment with only the words "Flee, fool, lest the Cuckoo take you," written on it.