This page explains how to find the Dah Kaso shrine.
How to Find the Shrine
Go south from Rota Ooh Shrine to find Digdogg Suspension Bridge. Go south across the bridges until you reach the island with the Hinox on it. Look under the bridge north of the Hinox to see the shrine down below. Float down to it from the bridge.
About the Shrine
This is a Minor Test of Strength shrine. The Guardian Scout wields a Guardian Spear. The chest in the shrine contains an Ancient Core.