@yusuke91 you don't need luck...all blueprints unlock when you need them you just have to conquer everything..if you are stuck do the repeat battles to get stronger...also get towns everywhere you can to increase your army strength and make castle battles easier
the game is pretty fun..1 bad thing you can't unequip items and therefore it is very hard to choose which 2 to have equiped...i have 3 items and i cannot equip the 2 i want because they keep unequiping the one i want :/ still very fun game xD