Niam's faction's planet was a planet in the Pegasus galaxy where the copy of Atlantis was built by Niam's faction. The planet was later attacked by Oberoth and the other Asurans, where they succeeded in wiping out the majority of the renegade faction. The planet likely had no Stargate as the one in the Atlantis copy wasn't real and the Organic Asuran copy of the First Atlantis Reconnaissance Team and Dr. Elizabeth Weir had to escape the city via Puddle Jumper and then hitch a ride to a planet where they could steal a ship on the back of the Aurora-class battleship. (SGA: "This Mortal Coil")
The city-ship on the surface is destroyed by an Aurora-class battleship