Airzones, Arifureta Vol 9

This was the new climate modulating artifact he'd created, the Airzone.
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Factoring in wind chill, it was likely close to -40 or -50 F in the tunnel. Were it not for the party's Airzones no amount of thick clothing would have been able to save them from those frigid temperatures.
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Kaori created a ball of water with magic and sent it forward. The moment it left the range of Suzu's barrier and the Airzones of the party, it froze into a solid sphere. The process happened in under a second.
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Since everyone had an Airzone, the harsh conditions of the labyrinth weren't a problem at all.