You can use “Equipment Enhancement Stone” to enhance your equipment. The Enhancement Stone must be the same rarity level as your equipment. The higher the enhancement level, the more status improvement to your equipment. The maximum enhancement level is 15.
By selecting equipment in your inventory and touching the “Enhance” button, you can access Equipment Growth Interface which you can Level Up, Enhance, Forge, and Combine Stone for your equipment. (Or access “Enhance” by touching the Main menu button on the top-right screen.)
The enhancement level will decrease by 1 upon failure from enhancement level 5 and above. (Safe enhancement guarantees a 100% success rate at enhancement level 1 – 5)