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Answer: Talk to Archmage Berlinader to start the quest.
Completion guide:
1. Please come to the Borean Tundra map and look for the mission NPC named Archmage Berlinader.
2. After meeting Archmage Berlinader, talk to him respectfully and receive the task.
3. Then, please go to the vicinity of the Demonic Nexus Crack and follow the instructions in the picture below to use the Cross Space Reshaper.
4. After the task is successfully completed, please return to Archmage Berlinader to submit the task.