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Darkness Zones are areas that Guardians encounter that separate public and private spaces. Guardians starting a story mission or strike will begin in a public area, and may encounter other guardians. However, once they enter a darkness zone, which is only accessible during that mission, they will be separated from randomly encountered guardians. Guardians that are part of the player's fireteam will come with them. 
Entering a Darkness zone is especially hazardous; not only are players separated from anyone outside of their fireteam, but respawning is also restricted. If a solo player is killed, or an entire fireteam has been wiped, Darkness consumes the player(s) and they will have to start over at the nearest checkpoint. However, so long as one member of a fireteam is still alive, it is possible to revive and respawn players. In Destiny 2, the same restrictions apply for the most part, except Normal and Prestige difficulty Raids. In Destiny 2, the Darkness Zones are called "Restriction Zones" probably due to the base game not mentioning the Darkness.
Respawn restrictions depends on what situation the player is in.
- No Restrictions: The player can revive themselves after three seconds, or by any nearby friendly players.
- Normal: If the whole party is dead, after three seconds the mission ends in failure and the team is reset to the last checkpoint, unless someone revives in those three seconds. If the player is in a team, any living teammate can revive them, or they can wait 30 seconds to revive themselves.
- Heroic Strike: Players cannot revive themselves (except for Sunsingers). They must be revived by a teammate.
- Nightfall Strike: Players cannot revive themselves (except for Sunsingers). They must be revived by a teammate. If the whole party is dead, the team has to start the mission over from the beginning
- Raid, Normal Mode: Players cannot revive themselves (except for Sunsingers). Teammates cannot revive players until 30 seconds later. In Destiny 2, the teammate can be revived immediately, but after someone dies, if everyone is not alive within 30 seconds of the death, Darkness will consume the player through "Shared Fate". Revives also are limited to one per teammate.
- Raid, Hard Mode: Players cannot be revived at all (except for Sunsingers) unless the team progresses to the next checkpoint. In Destiny 2, the revive restrictions are the same as Normal Mode, but when you die, you lose your revive token.
Note that Arena challenges have the same restrictions as normal mode Raids.