Just wanted to say that I'm loving this game, very fun!
I managed to get 18 of the endings but I'm positively stumped on Ending 3. I feel like I've tried everything possible in the brass hatch and the feasting hall so I'm just feeling a little lost on what to do at this point.
Ending 3 requires a specific wrong answer to the mechanical dragon puzzle. If you can figure out the right answer, you can probably guess what the wrong answer is.
Solving that puzzle just comes down to reading carefully. Most people will rush through that room to get to the puzzle and try again, but that's a mistake.