Weapons in MA:O can be enhanced by visiting your guild's Weapon Smith.

There are a few ways to unlock enhancements.

• Enhancements can be bought from a few stores, such as Baldric's Weapon Warehouse in Korach.
• Enhancements can be found as rewards, like from the Gold Medal drop table in Snake Caves.
• Enhancements can sometimes be earned by completing weapon challenges.
• Most often, Enhancements are learned from crafting and deconstructing weapons.