Hela was killed by Surtur's fiery sword after a fierce battle.
According to the provided reference, Hela was a formidable opponent, even impaling Surtur multiple times during their conflict. However, Surtur ultimately defeated her with his fiery sword. This act not only killed Hela but also brought about Ragnarok, the prophesized destruction of Asgard. The surviving Asgardians, including Thor, escaped before the destruction.
Here's a breakdown of the events leading to Hela's demise:
- Initial Conflict: Hela engaged in a fierce battle against Surtur.
- Hela's Offense: She impaled Surtur numerous times, demonstrating her strength.
- Surtur's Victory: Surtur dealt the final blow using his fiery sword.
- Consequence: Hela's death led to Ragnarok.
Therefore, the direct cause of Hela's death was Surtur's fiery sword.
