To stop Hela, the only method is to destroy Asgard. According to the reference provided, Surtur is the only one who can accomplish this.
Here's a breakdown:
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The Problem: Hela is extremely powerful and cannot be defeated by conventional means.
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The Solution: The reference states the only way to defeat Hela is to destroy Asgard.
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The Execution: The reference also states that Surtur is the only one capable of destroying Asgard.
Therefore, Surtur is the key to stopping Hela, but the cost is the destruction of Asgard.
