The Legend trilogy shifted to Arthurian/Norse mythology. The "Gate" here is , the Norse underworld, where Eitr—the source of all life—floods the realm. Lara’s mother, Amelia, is trapped inside the Gate. During Tomb Raider: Underworld , Lara doesn't just open the gate to save her mother; she realizes she must keep it closed to prevent the destruction of reality. In this arc, Lara evolves from seeker to Gate Keeper, choosing the safety of the world over her personal desire.
As a Gate Keeper, Lara must navigate the complex web of alliances and rivalries between various factions vying for control of these ancient artifacts. She must use her intelligence, wit, and combat skills to outmaneuver her adversaries, while also avoiding the pitfalls of her own ambition and the temptation of exploiting these powerful relics for personal gain. lara croft the gate keeper
There are several theories about The Gate Keeper's true nature and purpose: The Legend trilogy shifted to Arthurian/Norse mythology