I managed to get the book to open up! Strange noises seems to be coming from deep inside. Something beyond. I recognize the symbol, and it asks me of favors. But how? Why? I don't know yet... My wrist doesn't hurt anymore.

(I've made some work on the tutorial part of the game and have come a long way on sounds. Hopefully I'll be done with most "missing" features quite soon. That would mean I'll have a lot of time for adding content)