Quests

See Reassembly
Know Thyself
Hunting the Hunters

Quests are objectives that take place in Open Sectors and Missions, potentially with other players involved.
These are a long and challenging series of goals that are only available to players who have reached certain pinnacle, endgame statuses such as maximum XP & Power Levels, maximum Reputation with certain Factions, and more. They have multiple stages and require players to complete various tasks in different parts of the game world.
Legendary Quests offer exclusive rewards, such as unique Loot, cosmetics, and large amounts of XP and Currency.

Legendary Quests

Legendary difficulty quests are only available after completing the Seasonal Campaigns or other high level endgame activties.