I've been working on making minions way easier to use and understand. I've removed the ability to craft minions and upgrades and instead opted to tie minions into the economy by using a shop system. To access the shop just use /minions shop - upgrades can be purchased at the Server Shop /warp market. To upgrade your minion just right click it and select the gold bar on the top row of it's inventory, the max level for each minion is now level III.
Anyone has the ability to open the shop and purchase minions, but only users with the Elite/Deity rank can actually place them! Elite can still only place the cow rancher/wheat farmer minions, Deity have the ability to place all minions.