Destiny 2 - All 21 Golden Chest Locations (Regional Chests) on Nessus. Each Golden Chest gives 3 Nessus Tokens. That's 63 Nessus Tokens for all 21 Gold Chests.
The Nessus Tokens can be traded in at the faction vendor "Failsafe" in Exodus Black region (this vendor is unlocked after completing the main missions on Nessus). The Nessus Tokens will increase the reputation with Failsafe. Each reputation level takes 20 Nessus Tokens and rewards you with one random purple engram from the vendor'
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