Zingyao

General
Zingyao is a weaponsmith.

If you deliver him the required input amount of crafting materials and pay him a fee in gold he will craft you one of the weapons from his "menu".

Also, for a fee of 10 gold he can customize a weapon for you, which will increase its damage by 20%, but means that no other character except the one it is customized for can use that weapon.

Location
Zingyao can be found next to Gong Mei in Pongmei Valley.