This page explains how to find the Mozo Shenno shrine.
How to Reach the Shrine
This shrine is in the Hebra Region. Molli in Rito Village will give you "The Bird in the Mountains" shrine quest that helps you find the shrine. Put a pin in the big tree that she shows you, then go to it. From there, float northwest. You can reach the shrine through a hole in the southeast cliff wall of Biron Snowshelf.
About the Shrine
This is a Major Test of Strength shrine. Instead of stone pillars, there are metal blocks in the floor that you can raise with Magnesis. The Guardian Scout wields an Ancient Battle Axe++, a Guardian Spear++, and a Guardian Sword++. The chest in the shrine contains a Diamond.