Hello, I really like the concept here , im having fun!
Just reporting a bug, I havent tested with all the weapons yet but at least for the first few i tried, you only need 1 weapon, when you go to equip them in battle you can use 1 weapon and equip ALL your minions with that 1 weapon, and then when the battle is over it adds all the weapons back to storage as if you really had them all. So I can basically just keep selling all but 1 of my weapons, then do a battle, and then i have 6 weapons at the end of battle and then i can sell them and so forth