Intriguing ideas with the opportunity to unleash the East Wind! Fun concepts and thematic inclusion of a lot of air-relevant creatures here. I love the usage of the riddles, though perhaps the results of correct and incorrect answers could be employed differently? It's unclear what results from a strengthened portal, and the sudden AC drop at the end of the dungeon might feel arbitrary. I'd also avoid forcing surprise, no saves, or other effects on the players.
Great themes, setup, and varied dungeon design. Thanks for sharing!