Sasa Kai Shrine is a Shrine from The Legend of Zelda: Breath of the Wild. It is inaccessible until the Shrine quest "Sign of the Shadow" is completed, upon which it will emerge from the ground near an ancient platform just southeast of Gerudo Tower, in the Gerudo Highlands region of Hyrule. The Sheikah Monk Sasa Kai offers the "A Modest Test of Strength" trial and he will give a Spirit Orb to Link upon completion of the trial.
"A Modest Test of Strength"
This trial is a modest test of strength. Multiple Shrines contain tests of strength ranging from "minor" to "major" - modest is the middle ground. The only difference between tests of similar difficulty are the weapon set used by the Guardian that can be tasked with defeating; in this test, the Guardian is equipped with both a Sword and Spear. Once it is defeated, a door on the far end of the chamber opens revealing a chest containing a Frostblade and the monk Sasa Kai who rewards Link with the Spirit Orb.