Easiest way to level your troops while your away or if your bored do mission 11-primal beast you need 2 units, one with a lot of health (i use golem) and 2 a range class (spears preferably) the rest use whatever you want, put the golem a little in front and make sure you have the pheonix badge in so he can regain health. If your spearmen have the platinum sword and have all upgrades they will probably 1 hit kill most of the monsters and with the golem protecting them the monsters keep running in which lets you get 1xp per monster average exp is about 1000 per 30 minutes or so
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