Light of Blessing
"A crystal that glows with a light that purges ancient evil and purifies with its radiance."
Light of Blessing are Key Items from Tears of the Kingdom.
Tears of the Kingdom
Lights of Blessing are given to Link upon successful completion of a Shrine. Once Link collects four of them, they can be exchanged for either a Heart Container or a Stamina Vessel by praying to Hylia at a Goddess Statue.