Motes of Light

Motes of Light are collected to unlock the Exotic Khvostov 7G-0X. Eight come from the Visions of the Traveler in the The Pale Heart, one per Vision. The other nine come from the Overthrow bosses, three per zone, which appear at tier 4 and spawn at random, so repeats are common. That makes 17 in total.

Once all 17 are gathered, placing all eight Visions on their pedestals in the Lost City spawns a golden chest. Open it with the Mote of Primordial Light and the Khvostov 7G-02 to claim the weapon.