Additional information:As of 9/4/2013 this codex is obtainable inside Maelstrom Prison, when you kill Unleashed Maelstrom Terentatek in Maelstrom Prison: Sith Asylium.
We would like to thank Andrew W. for additional information.
Original Game Codex TextThe legendary terentatek is a vicious, tusked monster that feeds on the blood of Force sensitives. Terentateks are known to cluster wherever there is a strong dark side presence and to remain dormant for many years before emerging to hunt. How terentateks came to be is a subject of much debate. Ancient chronicles report terentatek-like creatures on Korriban, twisted by the dark side rituals performed by early Dark Jedi. Other sources attribute their creation directly to the Sith Lord Exar Kun, who performed many Force experiments on creatures on Yavin Four. Terentateks are undoubtedly one of the most vicious of all creatures steeped in the dark side, and they are doubly dangerous because of their unnatural resistance to Force powers. Jedi throughout the ages have tried to wipe terentateks from the galaxy, but the creatures have proven incredibly resilient. The most recent concerted effort was three centuries ago; many terentateks were destroyed, but the hunt took the lives of many Jedi Masters, as well.