https://www.polygon.com/2018/5/11/17345230/destiny-2-rasputin-armory-code-chamber

Destiny 2: Warmind is only a few days old, but it already has players hunting for exotics in strange places. In Destiny’s Raid Secrets subreddit, there is a megathread for players actively trying to crack Bungie’s latest code. The thread is currently over 700 comments long.

The puzzle itself stems from a well-hidden cipher found within the chamber of Rasputin himself, a major character and location in Warmind.