Home of the Faeries
- Gravity: 1.10 x Earth
- Diameter: 1.35 x Earth
- Atmosphere: Oxygen-rich, 1.85 times denser than Earth.
- Day Length: 26 hours
- Moons: 1 moon size of Mercury.
- Binary: No.
- Environment: Large continents framing large, deep oceans. Senin has an extended, mild temperate zone that eases to seasonal polar caps. Pre and post-destruction.
- Orbit: Nearly circular.
- Tilt: Moderate. Seasons are mild.
- Sun: Yellow dwarf, a little brighter than Earth’s Sun.
Senin was one of the founding worlds of the Cooperative. It was the originating seat of the Archives before Senin died. An experiment in treating a deviant Gatekeeper went dreadfully wrong, resulting in Senin melting into a ball of superheated magma. Temporal eruptions kept the Faeries from remaining in orbit in their vast floating cities, and the planet had to be abandoned altogether.