Superb Bone Handle

From the Composite Bow Upgrade quest introduced in the Come What Follows event.

Dialogue
You give Yuan Hanzu Hardened Bone. Yuan Hanzu tells you, "Yes, this bone has an aged hardness, it will make a wonderful handle." Master Hanzu deftly carves the Hardened Bone into a Superb Handle. Yuan Hanzu tells you, "Here you are. This can be used on the finest crafted Composite Bow and Composite Crossbow to increase their effectiveness." Yuan Hanzu gives you Superb Bone Handle. Yuan Hanzu tells you, "I wouldn't use that to upgrade your bow or crossbow unless you are sure you can handle a more powerful weapon. It may prove to be more than you can wield. If you decide you would rather have a different reward I can pass along a little experience I've learned in hunting."

You give Yuan Hanzu Fine Bone Handle. Yuan Hanzu tells you, "Alright, I'll just take that then. Here are a few pointers in tracking your target." You've earned 1,484,539 experience.