Fnarr (human designation: Wartris-II) is the second planet of the Wartris system, which orbits a small, K-type star 342 light-years away, in the constellation of Lupus. A super-Earth, Fnarr is roughly 1.35 times larger in radius than Earth, and almost three times as massive.

A much older planet than Earth, Fnarr is home to the H'darr, a Type-II Kardashev species and a founding member of the United Free Systems Alliance, of which humanity is now a member. Fnarr itself is an arid planet with a thick, nitrous-oxide rich atmosphere, covered from pole to pole in H'darr cities. Much of the planet's energy is derived from solar reflector stations, which tap into the solar corona of Wartris to obtain near-limitless energy. As a result, observers often mistake the intensely bright mirrors of the reflectors for tiny stars: this has been documented as a psychological advantage in H'darr warfare for millions of years.

No human has yet visited Fnarr due to its extreme distance from Earth, inhospitable conditions to humans and the H'darr's policy of not sharing advanced knowledge to species deemed to be on a 'lower' Kardashev level.