That'a a nice map-game that will probably live the players with a map that progresses in ages top-left to bottom-right o something like this.
I found the text a little bit cryptic and I suspect the preparation forgot to mention the game also tokens for the Elements too, since they are referred later.
The FAST RULES section comes really handy for understand the game flow and clear many of my doubts.
The Elements of each age are probably the part that seems more coesive and interesting of the game.
A pretty decent job in the complex, well done!