Here are some details for context:
- There are two civilisations, A and B. B is significantly smaller, around a few hundred people.
- B is visiting A's home world via a magic item that can teleport a limited number of people to other worlds (including other universes). B doesn't have a home world because they are travellers.
- Both civilisations will discover that A's home planet is in danger of complete destruction, though it will end up either not destroying the planet or not being as serious as they once thought.
- Some of B escapes to another world, in which they have access to a device that shows whether A's home planet still exists (can still be called a planet) or not. B will see that it does exist, previously thinking it would be completely destroyed. The device is magical.
Some other details:
- A is around our level (2023) of tech, but B has lots of varied tech from all across the universe because they can travel with the magic item, but they don't have everything, especially not big things since they are constantly travelling.
- A and B are mostly friendly to each other.
What natural event would make people think that the planet would be destroyed, but either still allows it to survive or is able to be stopped?
Something that might be possible is a big rock like a meteor or asteroid big enough to destroy the planet which would be redirected somehow, but I'm not sure how they would do that.
For even more context, B's magic teleportation item teleports (with a long cooldown) to a random world, each having an ID. Since they landed on A's planet, they want to help them as much as possible. Eventually, it seems like the planet will be completely destroyed, so they have no choice but to leave. In the next world they land on, they find a magic device that shows whether a world is completely destroyed or not given its ID. They find that A's world is still intact.
What are some events that could seem like it would destroy a planet, but doesn't actually, probably because it could be prevented?