The Eliksni, a species of insectoid scavenging raiders, are just some of the many types of characters that populate the world of Bungie’s loot shooter Destiny 2. Also called the Fallen, these descendants of a once-great civilization spend their days scouring the cosmos for vestiges of their lost past. I feel bad for them. I think about what isolation that may bring — rock-hopping across a solar system occupied by Guardians who only ever aim for your head. Then again, the life of a Guardian can be just as isolating.Each week, tens of thousands of Destiny 2 players (called Guardians) unfurl their to-do lists of bounties, challenges, quests, and pinnacle activities and embark on completing them before those activities reset each Tuesday. It’s a Sisyphean task — the live-service game is enormous. Playing it alone presents a unique challenge, but it’s made easier thanks to the community around it, including Twitch and YouTube streamers whose videos help demystify the game’s raids and puzzle...