Treasure

I know one thing that many people enjoy is the sense of excitement at finding a treasure of some sort.  I am thinking that treasure chests in this game will contain designs which can then be learned or sold.  I think that hiding these chests in the caves will give another incentive to people entering the caves, and it could make it so that new designs could slowly be introduced into the game.  I know I personally like to look for treasure, and having a design that no one else has would give a player a sense of ownership, especially if the design is critical for the success of the faction.  Learned designs are something that that would be forgotten once winning conditions have been met in order for the playing field to be made completely level at the start of a new round.