Enhancement

Enhancement is basicly strengthening your equipment, but it doesn't give as much as refining or upgrading, it's like leveling up your equipments.

Enhancement only costs zeny and can be enhanced up to your character base level.

To enhance your equipment, go to Inventory, then click Enhancement tab.

It depends on the type of the equipment, what stat that it would enhance. For headgear it would enhance the magic def stats and for shoes it would enhance the defense stats.

When you replace your equipments, you can also replace its enhancement level into the other one for free.

Also, you can still reset the enhancement and attain all your zeny used in enhancement at the Furnance NPC. You may want to reset your equipment's enhancement because you can't put an enhanced equipment on the market.