In Fortune Crafter you start as simple dude. You have 2 item slots: one for melee weapon and one for ranged weapon. Every weapon in the game has 5 upgrade slots. Dring run you can find new weapons and new upgrades that can be installed on your weapons. After you found needed upgrade you can level up it as many times as you wish as long as you have enough orbs(local currency). Most weapons also have special upgrade. It is preinstalled and has unique effect for every weapon, for example, in this game there is a weapon that allows you to ressurect enemies to fight for you, the most limiting factor for this weapon is the fact that ressurected units do not travel with you between rooms, maxing special upgrade of that weapon will remove this limit allowing you to raise an undead army that will tramle every enemy standing against