https://www.gamespot.com/articles/big-warframe-update-out-now-on-pc-adds-new-open-wo/1100-6454024/

The next big update for Warframe is now available for some. The Plains of Eidolon expansion arrives today on PC (with a PlayStation 4 and Xbox One release on the way later), adding a sprawling new area, weapons, and a slate of other content to the space action game.

The biggest addition with this update--both literally and figuratively--is the eponymous new Landscape, the first open-world area in Warframe to date. Up to 50 players can gather together here on the basecamp of Cetus and play mining and spacefishing mini-games, take on quests, battle enemies, and more. The Plains also have a day-and-night cycle; once darkness falls, monsters begin emerging from the waters, including the Eidolon, which developer Digital Extremes describes as a "towering monstrosity lured to consciousness in search of something dangerous and mysterious."