This looks beautiful and the idea is really cool. I think my only substantive note is that I would call out the "object of the game" and mechanically what can happen in a separate paragraph early in the trifold (usually I use the cover or inner flap for sorts of key info like this). I find myself scanning around looking to see what is the relic, why do my players want it, how do they switch from day to night, etc. I would rather have that already in mind and then I can continue reading and simply soak in the wonderful setting and beautiful art and design!