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Prerequisite: Priority: The Citadel II (Mass Effect 3)

Ialessa is a system in asari territory. Sanves is the only habitable terrestrial world in the system and a tourist destination, and Zylium acts as a refueling spot and auxiliary hospitality sector.

The system has little else in terms of resources other than copper deposits in Nossia. Of particular note is a planet-encircling supercollider in Trikalon that's targeted by the Reapers only days after its first activation.

Ilmnos[]

Ilmnos is the first planet orbiting the star Ialessa.

Main article: Ilmnos

Nossia[]

Nossia is the fifth planet orbiting the star Ialessa.

Main article: Nossia

Sanves[]

Sanves is the second planet orbiting the star Ialessa.

Main article: Sanves

Trikalon[]

Trikalon is the fourth planet orbiting the star Ialessa.

Main article: Trikalon

Zylium[]

Zylium is the third planet orbiting the star Ialessa.

Main article: Zylium