EpicSpire's Quality ModSlot Boost is a simple but effective add-on that will increase the number of ModSlots for you. It will increase the number of ModSlots for each weapon and armor by one per tier. So, if you are using a weapon or armor that has not been equipped with a slot yet, you can expect to receive one by using this mod.

The quality of each weapon or armor is not increased by this add-on. It only increases the number of ModSlots.

It can work with any weapon and armor added by any other XML modlet.