Kamuy Mosir is the dwelling of the Kamuy. It was believed they would depart from Kamuy Mosir and roam Ainu Mosir (the human realm) as bears. The Ainu would then kill the bears in a practice called iyomante to free the Kamuy inside the bear so they could go back to Kamuy Mosir.
Design
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In Golden, Teddie starts with Kintoki-Douji. It transfigures into Kamui upon maxing his Social Link, and can further transfigure into Kamui-Moshiri during winter.