1. First, we go to the Cold Sky Nail, as shown in the picture below:

2. Then find three fire spirits and bring them back to the platform, as shown in the picture below. ：

3. Then start the limited time challenge, as shown in the picture below:

4. After completing the limited time challenge, go and smash the ice tree behind, as shown in the picture below:

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5. After breaking the ice tree, click to start the Cold Sky Nail to thaw it, as shown in the figure below:

6. Then enter the unlocking animation, and the unfreezing is complete, as shown in the figure below :