In this world, the closer you are to your soulmate, the warmer you are. The further you are from them, the colder you are.

Nahida sent Wanderer to the grand bazaar for candied nuts. He felt warmth, realizing he was near his soulmate. He retraced his steps to find Anon, who is unaware, possessing a Pyro vision and thus accustomed to warmth.