Facet of Dominance, Awakening, and Generosity

These final three fragments come from Memory Vestige: Light consumables.

Light Vestiges are obtained through specific enemies in the six cyst missions, which can be unlocked by progressing the Alone in the Dark questline from Micah-10. While their presence seems to be random, enemies that drop these items will be glowing white. Most reports from players say they had the most luck finding these enemies in the Sword Dance, Searing Light, and Aerial Ace cysts. After collecting five, they'll auto-convert into a legendary consumable (such as the one pictured below) that leads to a prismatic chest.

Memory: Seclusion of Light leads to Facet of Dominance. Beginning at The Blooming, head into The Seclusion until you reach Zavala's house. The chest is located near the waterfall at the top of the hill, on top of some rocks.

Memory: Refractions of Light grants Facet of Awakening. Starting at The Blooming, go into The Refraction and continue until you reach the search area marked on your map. From there, look up into the trees; it should be right around where the Guardian is looking in the picture below.

Facet of Generosity

Finally, Blooming of Light leads to Facet of Generosity. In The Blooming, make your way up to the base of the large tree in the center of the area. The prismatic chest will be in roots on the west side of the tree.