Through a skit, it is revealed that Tenebrae met Mithos Yggdrasill, Martel Yggdrasill, Yuan Ka-Fai, and Kratos Aurion during their journey at the time of the Kharlan War four thousand years ago. They must have known each other well, for Tenebrae displays some curiosity as to Mithos's whereabouts after learning that Lloyd's party had met him. When Richter Abend and Aster journey to the Ginnungagap to warn Ratatosk of the world's mana crisis, Ratatosk is reduced to his core form after a battle with Richter. Before Richter and Aqua could destroy the core, Tenebrae awakens and grabs the core, for so to flee to the surface to prevent Ratatosk's death. At some point, Tenebrae met Marta, and she aided him with protecting the core from the Vanguard, who also wanted it. During the Blood Purge in Palmacosta, they are separated, and when they meet again, Tenebrae sees that a fake of Ratatosk's core is placed on Marta's forehead, and that the real core awakened to take the form of a human to hide until his powers returned.