Etheric Light

"A volatile synthesis of energized matter and self-modifying energy constructs."

- In-game description

Etheric Light is an end-game upgrade material used to upgrade Legendary equipment to the maximum available Attack or Defense levels. It can be found in the Prison of Elders, Trials of Osiris, and occasionally in the Nightfall Strike.

Trivia

 * Etheric means multiple things; one possible definition is a substance pertaining to the upper regions of space, or the heavens. Another is the theoretical substance that occupies all space, used to explain electromagnetic radiation but later disproven with the existence of photons.