History of Engram Stockpile

The '''Engram Stockpile''' is a Ghost upgrade. Once unlocked, the first five Pale Heart Engrams drop at an increased rate after each reset.

Unlocking

The upgrade unlocks by reaching a certain Ghost rank. Ghost rank rises through Pathfinder objectives, Overthrow, Lost Sectors and Cysts, and opening Pale Heart chests. Overthrow chests are one of the easiest sources of Pale Heart Engrams.