Eris

"Rapid Corpus expansion has led them to build outposts in this far flung sector of the system"

The Corpus are the controlling faction on this planet. This is the only planet to not have a boss mission, as Phorid was relocated to inhabit Invasion missions, and only when they reach the planet's boss level. This makes Nyx currently unavailable to farm.

Expected Enemies
Infested can appear during Invasion missions.

Trivia

 * Many of the Eris' missions are shortened names of various diseases, parasites, and fungi.
 * Cyath is recommended to farm Plastids and affinity.
 * Eris is completely controlled by the Infested
 * It is very likely that some of the Orokin Derelicts are sited in Eris, as the descriptions says that 'The Infested are spreading throughout the Orokin Derelicts in this region'.
 * Although Eris is currently the farthest known natural object orbiting our Sun, Sedna and Europa are farther out in the Solar System UI.