I Don't think of this as a cheat but what you have to do is find one of the four big beetles which are battler (brown), dazzler (blue), magma (red) and, puff (green)then kill it so it will be in your tower's dungen and from there you can fight them any time but it isn't going to be easy if you don't have some minions. Anyway there are 25 beetles and each beetle gives you three orbs do the math and thats 75 minion orbs each time you have a battle well have a good time!

I don't really think this is a cheat but, Ok first what you need to do is find a big bettel that give you 3 orbs of whatever color it is, well fight one of those big bettles and it will now be in your tower's dungen and you can fight it any time you want it may be hard a first but there are 25 bettles in each dungen fight and each bettle gives you 3 orbs 3x25=75 orbs per fight and it really helps out with smelting well good luck with this!