It might be a creative or artistic concept. 'Stars' could be metaphorical, representing people or things that shine. 'A solo story' would then imply that each of these 'stars' has its own independent narrative, like in a collection of short stories where each character has their own journey to tell.
It could mean that each star has its own story to tell. Stars in the sky have different properties such as size, brightness, and age. Their formation and evolution are unique processes, which can be seen as individual stories.
I'm not sure specifically as I haven't read it. But generally, a novel titled 'the gauntlet' might be about a challenging journey or a series of difficult tests that the characters have to face.
He might find it in a hidden chamber in Hogwarts. Maybe it was left there by a powerful wizard from long ago who had some connection to other universes.
A great infinity gauntlet story could also be fan - made ones. There are some amazing fan fictions out there. Some focus on alternate universes where different characters get their hands on the gauntlet first. For example, a story where Loki manages to steal the gauntlet before Thanos. It explores how his mischievous nature would play out with such ultimate power at his disposal. He might not have the same grand plans as Thanos but would surely cause chaos in his own unique way.