"Emerald Light"

"Emerald Light" is a legendary Warlock bond added in The Dark Below. It can be purchased from Eris Morn for 2500 Glimmer.

Trivia

 * It is implied in the in-game description that Toland, the Shattered gave the bond to Eris Morn so she could be seen as Hive by the Hive, and could escape from Crota's wrath.