How to Get Sleeper Simulant

Taken King: Sleeper Simulant

Oct. 7, 2015 — "The search for Sleeper Simulant starts with 'The First Firewall' quest!  To unlock it, you’ll need to turn in all four Legendary 'DVALIN' relics (that drop at random) to the Gunsmith.  This will be unlocked on the 7th of each month."

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Source: Planet Destiny, Guides