Enhancement
Attack and defense breakpoints, and which insurance scroll each tier uses.

Enhancement raises the base attack and defense, which shows up in the physical or magic damage result at the bottom of the item window.
Insurance by tier

| Refine tier | Enhancement | Scroll |
|---|---|---|
| Common | +0 to +7 | Normal insurance |
| Advanced | +8 to +10 | Normal insurance |
| Special | +11 to +15 | Normal insurance |
| Masterpiece | +16 to +20 | Advanced insurance |
| Legend | +16 to +20 | Advanced insurance |
Materials
- Insurance scroll. From +6 up, a failed attempt destroys the item if you have no scroll. +5 and below do not need one.
- Enhancement powder, required.
- Enhancement stone, optional. The legendary stone for ranks past +20 is not on sale yet.
Bí Bảo, both the normal and cash versions, also uses Tinh Tú Pháp Bảo from the shop. That item adds +5% success at every rank from +5 to +24. It is expensive.