At the beginning of Thor: Ragnarok Surtur tells Thor, "I am Asgard's doom and so are you". Isn't Thor the good guy? Then why does Surtur say this?
Surtur is the guy who starts Ragnarök. Thor is part of Ragnarök when he battles with tha big snake "midgårdsormen" (don't know English translation)– mathreadlerMar 19, 2019 at 9:25
Surtur tells him that because
he'd be the one that will initiate the Ragnarok.
Near the end, you can see that Thor wasn't able to kill Hela, so, in order to do that, he asks Loki to put the Surtur's crown in the eternal flame, so Surtur can destroy Asgard along with Hela.
Thor: Asgard's not a place, it's a people. This was never about stopping Ragnarok...it was about causing Ragnarok.
Thor: (to Loki:) Go to the vault. Surtur's crown. It's the only way.
3So Surtur can see future– Ankit Sharma ♦Mar 18, 2019 at 7:29
2@AnkitSharma Not necessarily. Surtur is old, so he probably knows about Hela and he is a good judge of character. He knows that Ragnarok will eventually happen - and he knows that it will destroy Hela - so he presumes that Thor will eventually have to use him to stop Hela - it is not a 100% sure, but if he knows Asgards history and some of Odins secrets it is a pretty good bet.– FalcoMar 18, 2019 at 11:31
12I'm sure there were prophecies regarding Ragnarok as well. I can't remember off-hand if that was mentioned in the movies.– krillgarMar 18, 2019 at 11:35
6@krillgar the prophecies were definitely in the movie. Mar 18, 2019 at 11:51
2Then the prophecies would lend more credence to Surtur (and many others) to figure out that Ragnarok was imminent. It'd be pretty easy to deduce that Thor would fit the roles of the prophecy.– krillgarMar 18, 2019 at 13:00