Head to Light Elf Shore, northwest on the Lake of Light and dock the boat on the nearby beach. Turn right and head to the corner of the beach to find a corpse with this Artefact.
Head to Light Elf Sanctuary, southwest on the Lake of Light and dock the boat on the nearby beach. Proceed through the first gate and then take a right and pass through the next gate, head right through a cave leading back toward the beach and over a bridge of vines to find the Artefact at the end.
As you pass through the Ringed Temple, you’ll come upon a Stone Ancient. Once defeated, reactivate the light bridges by destroying the appendages and then take the left light bridge to reach this Artefact.
When you return to the trench after obtaining the Light of Alfheim, you’ll take a lift back down to the trench now shrouded in darkness. Look in the cells of the first room once you leave the lift to find this Artefact.
As you proceed further into the trench, you’ll reach a room with all the cells locked with light. Look into the air to find the crystal hanging and knock it down to the ground, opening the cells in the process. Once the enemies are defeated, look into one of the cells to find the Artefact.
On your way back through the trench, you’ll reach the wheel that controls the platform again. Spin it until the platform reaches its lowest point and then go through the passageway at the bottom, finding an open cell with the Artefact.