Thanks for your compliment. And according to your comment on RPG Maker web, I assume that you have found the "Stone Egg" near the tree. Try to put it to where it should be on the tree, and the mask will reveal itself. When I designed this game, I was into the puzzle things too much (because my very first game was a puzzle one). Now to think of it, sometimes it makes players feel frustrated. That's why I have decided to reduce the difficulty, as well as the number of puzzles in my next game, to focus more on "RPG" element than "RPG - Puzzle". Thank you for enjoying the game, and stay tuned for the upcoming public demo of "Yggdrasil Chronicles - A Record of Valkadia".
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You will not receive the mask. It is a part of the tree, once you put the egg into the nest, and that is the mask I'm talking about. Just come back there at the time when the "eye of the night" reaches the highest point and you will see. In case you want to skip 6 hours (in-game time), go to the Inn and take a rest there.