I just wanted to share this list from a Reddit post by [i]Rook7425[/i]. It shows the shells that provide perks for specific locations. [b]Crucible Shell List[/b] [i]Competitive Shell Hunter Shell Kill Tracker Shell Last City Shell Titan Shell Two of Diamonds Shell Warlock Shell[/i] [b]EDZ Shell List[/b] [i]Aggressive Shell Heraldic Shell Honeycomb Shell Jagged Shell Number Two Shell[/i] [b]Titan Shell List[/b] [i]Avalon Shell Half-Submerged Shell Kingfisher Shell Starfire Shell Twilight Shell[/i] [b]Nessus Shell List[/b] [i]Bold Shell Crescent Shell Lambda Shell Lotus Shell Tower Shell[/i] [b]Io Shell List[/b] [i]Blue Moon Shell Graylight Shell Hemisphere Shell Interchange Shell Vertical Shell[/i] P.S. Telemetry perks are pointless in my opinion. Your best option is a [b]10% XP/10% Glimmer[/b] roll. Used with a Fireteam Medallion, Bright Engrams drop more frequently, which [i](in turn)[/i] provides the opportunity to earn more Bright Dust to purchase items from Eververse. My personal favorite is the [b]Cache/Resource[/b] roll. I prefer to exchange tokens/materials for armor, weapons and shaders. I hope this helps. Good luck!