Engram

An engram is an encoded physical object which must be decrypted into either weapon or armor to be usable. Engrams can be dropped by defeated enemy species or purchased from Master Rahool in the Tower. Each engram is of a particular weapon or armor type and stored in the Guardian's corresponding inventory slot until decoded. When decoded, engrams become a particular weapon or armor piece, scaling with the player's level at the time it is decoded.

Engrams come in several levels of rarity:
 * Encoded engram (White)
 * Encrypted engram (Green)
 * Decoherent engram (Blue)
 * Legendary engram (Purple)
 * Exotic engram (Gold)

Encoded engrams can be decoded immediately by players in the field. Encrypted engrams must be decoded by Master Rahool until the Guardian reaches rank 1 reputation and level 15, at which point encrypted engrams will be decoded immediately in the field. Decoherent and rarer engrams must always be decoded by Master Rahool.

Encrypted engrams may contain an uncommon item or a rare item. Decoherent engrams may contain a rare item, a legendary item, or a currency. Legendary engrams may contain a legendary item, an exotic item, or Ascendant Materials. Exotic engrams contain an exotic item for a random player class.

Means of Obtainment
All levels of engrams can be found in battle, but there are other means of obtaining them. These include:
 * Purchasing legendary or lower engrams directly from Master Rahool in the Tower with Glimmer
 * Purchasing exotic engrams from Xûr when he appears periodically in the Tower with Motes of Light
 * Leveling up in Cryptarch Rank

Engrams of Decoherent or rarer quality that the Guardians fails to pick up in the field will be sent to Kadi 55-30, where the Guardian can pick them up after returning to the Tower.