well I would like to discuss something interesting with the users of this particular forum regarding this particular game A valley without Wind. Right know it is quite effective to go for the gem veins in caves with the level which is lowest for the given tier. Hence when you are at the level 10, 20, 30. The guarding bosses power scales fully with the level but the reward goes for the every 10 levels. Can you tell me how can I rectify the same?