J-Gnk was the fourth Sentinel of Aether, who saw the beginnings of the Luminoth Dark Age, and was Sentinel when the Ing first attacked. He died in battle defending the Great Temple. He was succeed as Sentinel by U-Mos. His is one of four statues erected in the Hall of Honored Dead in the Temple Grounds.
The statue of J-Gnk as seen in the Sky Temple Gateway
- "This is a statue of J-Gnk, the fourth sentinel of Aether. J-Gnk was the Sentinel of Aether when the Ing brought war to Aether. He died in battle while defending the Great Temple." —Scan Data (Metroid Prime 2: Echoes)