Very good compact adventure that excellently captures the jam's them! The initial foreboding of the camp descending into weirdness as they uncover the Wyvern's secret feels very fitting. Characters being enthralled (and still worshiping the statue when the time comes), yet wanting to leave feels like a fun roleplaying challenge to tackle. I feel like a lot can be teased out from the prophet's backstory just in the few sentences describing his chamber; there's a sense of pathetic tragedy there that's really potent.
I also like the wyvern depiction being this big, weird bug. I love a twist on a classic monster.