The Sifumim Shrine in The Legend of Zelda: Tears of the Kingdom can be found just north of Korne Beach, southeast of the Rabella Wetlands Skyview Tower.
In order to clear this shrine, you’ll first need to complete the Proving Grounds: Flow challenge. During this challenge, you’ll not be allowed to use any outside equipment. Instead, you’ll only be able to use what you collect during the challenge.
To start, head down the stairs and collect the 2 sticks and shield near the weapon rack. Take out all of the Constructs to complete the challenge. What worked best for me was grabbing a bow off of one of the constructs on the rafts and then taking out the big one in the center of the room using the bow. If you can knock it in the water, it will die instantly. This will then allow you to pick off the other constructs until you get them all, completing the challenge and unlocking the altar room. Head to the altar to receive your Light of Blessing. Make sure to loot the chest along the way to receive a Captain II Reaper.
Click here for more guides and walkthroughs on The Legend of Zelda: Tears of the Kingdom!