Lh'owon is the homeworld of the S'pht, near the galactic core. It was terraformed by the cybernetically enhanced S'pht for the Jjaro, but after Pthia's death, Yrro left and let the S'pht live on the paradise they had created for him. Around the year 1800, the planet was all but destroyed in the war in which the S'pht were enslaved by the Pfhor. By the time Durandal and his S'pht had found Lh'owon, the Pfhor had been there for fifteen years and had set up a command post. Most of Marathon 2: Durandal and Marathon Infinity takes place on Lh'owon.