Since theres no housing system in the game, i guess that we can just imagine. Where does your guardian live? Is on the last city? Nessus? My guardian lives in a isolated part of the Earth, just with his ghost as company. He loves to sit, relax and have a cup of tea when he can, watching the ruined landscape from the window of his makeshift house.
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In the Ukraine which will soon be New Russia which will eventually become Old Russia.