Graxos IV is a planet in Green Lantern Sector 2815. It is the home world of the Rrab family, many of whom have served as officers in the Green Lantern Corps. The most distinguished Corps member from Graxos IV is Arisia Rrab.
Graxos IV is also the location of a special hospital for the criminally insane. Future Sinestro Corps member Karu-Sil of nearby Graxos III was incarcerated here by Blish Rrab who had discovered her as a young girl. 
- In the bio for Karu-sil on the back of Mattel's The Colour of Fear 2 pack, Graxos IV is misspelt as Glaxos IV, though Graxos III is spelt correctly.