1. RELIC - "A FATHER'S SWORD" - The Athanatoi
Hidden information: Look at where the Sword is broken.
Retrieving while doing Story:
After the "let the truck fall down puzzle" Lara uses the zip line to climb north into a new area with a circle shaped room. Slide down the ramp, climb up the ice wall.
Retrieving after doing the Story:
Reach the area through the well in the big room (half circle shape on the map). Climb down the ice wall, mind the trap. Jump onto the Floor remains to get to the area with the circle shaped room.