This will bring about an ingredient called the Old Brass Compass that is required to craft the Raven Claw Talisman at one of the Fence Vendors. Below is a walkthrough for how to find all 10 Rock ...

Take the Old Brass Compass to a fence. If you hand it and $29 dollars over, you’ll get the Raven Claw Talisman. This talisman will permanently slows down weapon degradation by 20 percent.

You get the Old Brass Compass for completing the “Geology for Beginners” Stranger quest and finding all ten rock carvings. This material is needed to craft the Raven Claw Talisman.