Remnant
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The Remnant are a group of people in Rise of the Tomb Raider. They are the descendants of the citizens of Kitezh that were forced to live in the wilderness of Siberia after the city was lost to them during an Mongolian invasion.
Lara discovers them in Siberia and soon allies herself with them as they are also threatened by Trinity. The first time Lara hears about the Remnants is in a Cut Scene in the Siberian Wilderness while listening to Trinity radio chatter at the Wilderness Refuge Base Camp:
She later discovers them in person when she is threatened by Sofia to abandon her search, but she soon is able to gain their trust by helping them out on multiple occasions.
They provide Lara with side quest missions that reward her with special items like e.g. the Lock Pick and open up access to certain areas that previously were unavailable to her. All missions presented to Lara by the Remnants are optional. The main story of the game can be played without these side quests.
Later in the game Lara fights side by side with them against Trinity soldiers and the Deathless that now occupy the lost city. In the end Lara is well respected among the inhabitants of the valley.