Ple-Sen
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Turns out, this house belongs to Mayor Tsonduh Siseba, not Sery. We can go back to the second location and report the situation. Alternatively, we can start clearing the house now (if there's anyone to clear out). But in that case, we might not get the reward for clearing the mansion. If we do clear it, it's best to check the lower rooms first (so no one can sneak up from behind), open the door with the elemental, and then go upstairs.