You find a shrine west of Manhala Bridge in Hyrule Ridge that has a beam of light shining toward a nearby cave.

Shrine Location

Usazum Shrine is located above the ground in Hyrule Ridge at -2139, -0873, 0093, which is west of Manhala Bridge.

Rauru's Blessing

After you complete The Satori Mountain Crystal to open this shrine, go in and open the chest to get a Zonaite Spear.