Price check on Storm Bow.

I found this in Tombs the other day amd I am wondering what it is worth.

Sundering Storm Bow Of Fortitude
15-28 Damage (req. 13 Marksmenship)
+15% dmg Always
-5 Energy
10/10 Sundering
+29 health



Oops, forgot to include the req. Thanks for reminding me.

What is the req?

My one and only Bump.