Map:Tears of the Kingdom/TheLakeHyliaCrystal
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(This is located in Lake Hylia Whirlpool Cave .)
It seems that you can enter a Shrine of Light
if you offer up a crystal.
Follow the ray of light, and offer up the crystal at the shrine.
Simply go to the sky island directly above the whirlpool to find the crystal and drop it down.
No challenge in the shrine.