I got Call Colossus "legally" by checking back every time i gained a level (and filled my troops to the max...), after a few tries i got it!
@Fatt_Shade: Good to know, i think i'll just give them to myself then, i want to get the biggest Dragon army i can, and those items really help with that...
@gempepaine: I guess you edited his store data or something? I don't know how to go about that...