Maag No'rah Shrine
Just southwest of the Maritta Exchange Ruins, there is a Bokoblin camp with a large lookout tower. Climb the tower and face southward to find some destructible rocks along the cliffside at about the same height as the tower. Shoot a Bomb Arrow to destroy the blocks, revealing an entrance to a cave. Climb up into the cave to find the shrine.
Maag No'rah's Blessing
After all that effort, the shrine itself contains no challenges at all. Simply move forward, open the chest, grab the Silver Rupee and then speak with Maag No'rah at the altar for your well-earned Spirit Orb.