From patch notes 10.12.2018

Endgame changes

Lately, we have received some great suggestions and feedback from the community regarding the endgame meta. We are glad that the Dev team had similar discussions and have implemented the following:

• Position revealing has changed from continuous to periodic

• As Ymir reaches the final zone, the storm will become increasingly fierce and gradually reduces visibility, reaching the minimum within one minute

• After the temperature reaches -30C degrees, it will keep dropping and the damage to players will increase rapidly (The time it takes to reach -30C degrees and the damage dealt during this time remains the same)

https://steamcommunity.com/games/755790/announcements/detail/2827590424583007543