Sedna

Mercury

Venus

Sedna

If there are new discoveries to make or ancient tools of war yet to be excavated, the Grineer want to be there first — at the frontier of space exploration. Always seeking the upper-hand against their foes, they have numerous deployments that border the known reaches of our solar system, poised to enter brave new territory and unexplored space on command.

—Sedna Fragment

Sedna is a dwarf planet where the Grineer are the controlling faction.

Sedna becomes accessible by defeating the Specter in the Sedna Junction on Pluto after completing the required tasks.

The Assassination Target on this dwarf planet is Kela De Thaym, who is located in the mission node Merrow and where the blueprints for the parts of the Saryn Warframe can be obtained. Uniquely, in order to access the Kela De Thaym boss battle, players must accumulate sufficient Judgement Points by playing the various Arena missions on Sedna. As of Update 20.0 (2017-03-24), 25 Judgement Points are required to access the boss battle, with 12 being expended each time a player is successful in defeating Kela De Thaym.

Sedna does not currently have a Tenno Relay.

Enemies

Invasion Missions: The Corpus will appear as a "Sideable or Opposing" faction while the Infested will always appear as an "Opposing" faction during Invasion missions.

Spy Missions: Special enemy variants have a chance of spawning during Spy missions.

Survival Missions: The following lists below do not apply to Survival missions.

Corpus	Grineer	Infested
Corpus Techs Crewmen Elite Crewmen Prod Crewmen Fusion MOAs MOAs Shockwave MOAs Oxium Ospreys Shield Ospreys	Butchers Flameblades Powerfists Scorpions Ballistas Elite Lancers Eviscerators Lancers Scorches Seekers Shield Lancers Troopers Bombards Commanders Heavy Gunners Napalms Rollers Manics	Chargers Leapers Volatile Runners Nauseous Crawlers Toxic Crawlers Ancient Disruptors Ancient Healers Toxic Ancients

Missions

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Trivia

Sedna is a planetoid three times farther from the Sun than Neptune, and is widely believed to contain water. It is named after the Goddess of the sea and marine life in Inuit Culture Mythology.
- Appropriately enough, Sedna's missions are named after water spirits of various cultures.
Around this location is where Alad V located dormant Tenno – unknown to even the Lotus – for the Zanuka Project. This act was indirectly responsible for The Gradivus Dilemma.