Glimmer

Glimmer is a consumable item in Destiny. Not much is known about glimmer, including how it is obtained or the full extent of how it can be used. It is known, however, that glimmer is required to upgrade weapons.

It is speculated that glimmer is dropped by powerful enemies after defeating them. This is unconfirmed, although during Bungie's E3 2013 gameplay demo, several enemies were shown dropping shining, ethereal balls after being defeated, similar to "experience orbs" and/or virtual currency drops in a number of other video games.