With a guide, Lara travels to the snowy Peruvian Mountains, eventually reaching a massive stone door. After climbing to the top and locating a switch, the door opens, revealing a pack of wild wolves who set themselves upon the guide. Though Lara swiftly uses her dual pistols to dispatch the wolves, she is unable to save the guide and so enters the tomb alone.
After trekking through the caves, filled with both wolves and dart traps, Lara reaches the underground village of Vilcabamba, which Qualopec had ruled over before his death. While exploring she finds a large door that leads to a large underground waterfall obscuring the entrance to Qualopec's tomb. The gears for the mechanism that stops the waterfall are located in the Lost World, an ancient valley filled with carnivorous dinosaurs that had survived mass extinction. After battling the velociraptors and T-Rex inhabiting the Lost World, Lara retrieves the gears and stops the waterfall. Inside the tomb, the entrance to Qualopec's resting place is blocked by three gates. Braving traps and velociraptors, Lara finds the switches to unlock all three gates and enters Qualopec's tomb, where she finds his skeleton sitting on a throne, with two mummified corpses standing rigid on either side of him. After noticing that the one of the mummys topples over with a moan after she fires her pistols at it, Lara takes the piece of the Scion from the pedestal in the center of the room. This immediately causes the tomb to begin collapsing, and Lara barely escapes with her life... only to be attacked by Larson, who had followed her to Peru. After disarming and wounding him, Lara interrogates Larson, learning that Natla had sent him to kill her and take the Scion piece, and has also sent fellow treasure hunter Pierre Dupont after the rest of the pieces. After knocking Larson unconscious when he attempts to tackle her, Lara leaves the tomb with the intent to find out why Natala betrayed her.Somewhere in America, Lara breaks into the Natla Technologies building and discovers a medieval monk's journal in Natla's office. The journal reveals that the Scion is Atlantean in nature, and the second piece is located in the tomb of Tihocan, a ruler of Atlantis. The journal points the location of the tomb to Greece.