#scifi nerds, I need your help identifying an #SF novel I read decades ago

@DoomsdaysCW @reallyzen Hmm. So.
It turns out I actually have all three of the Dancers at the end of Time books on my bookshelf in the "books I haven't looked at in decades" section.
So it _could be_ that.
But I read the Wikipedia plot summaries, and they don't sound quite like the book(s) I remember.
Here's my theory: I probably read them when I was a pre-teen, so maybe a lot of the stuff in the synopsis just went completely over my head then, and didn't stick in my brain?

#scifi nerds, I need your help identifying an #SF novel I read decades ago.
The main characters each possess some sort of device which gives them essentially infinite power. They use it to create and destroy whatever they want, to travel all over the planet, basically anything.
They don't understand how the devices work. Turns out they're connected to giant machines—maybe originally for terraforming?—that are starting to break down, and the knowledge of how to fix them has long since been lost.

#scifi nerds, I need your help identifying an #SF novel I read decades ago.
The main characters each possess some sort of device which gives them essentially infinite power. They use it to create and destroy whatever they want, to travel all over the planet, basically anything.
They don't understand how the devices work. Turns out they're connected to giant machines—maybe originally for terraforming?—that are starting to break down, and the knowledge of how to fix them has long since been lost.

#scifi nerds, I need your help identifying an #SF novel I read decades ago.
The main characters each possess some sort of device which gives them essentially infinite power. They use it to create and destroy whatever they want, to travel all over the planet, basically anything.
They don't understand how the devices work. Turns out they're connected to giant machines—maybe originally for terraforming?—that are starting to break down, and the knowledge of how to fix them has long since been lost.

@jik it's a bit outside of your description, but it sounds like what happens when Teela eats the tree-of-life root and becomes a slightly dodgy pak protector in Ringworld. Pak protectors featurein other parts of Tales From Known Space as well, notably they have an artificial world of islands on which they stock samples of every known race, but shit is a little bit broken there.

@jik the other title I'm thinking of is more fantasy, being the Wind Singer

@DoomsdaysCW @reallyzen The thing that's tripping me up is that it seems like time travel plays a significant role in the Dancers books, and I don't remember that _at all_ in the books I read.
But like I said, maybe I just forgot?

#scifi nerds, I need your help identifying an #SF novel I read decades ago.
The main characters each possess some sort of device which gives them essentially infinite power. They use it to create and destroy whatever they want, to travel all over the planet, basically anything.
They don't understand how the devices work. Turns out they're connected to giant machines—maybe originally for terraforming?—that are starting to break down, and the knowledge of how to fix them has long since been lost.

@DoomsdaysCW @reallyzen I suppose I'm going to have to read Dancers at the end of Time again to settle this.

#scifi nerds, I need your help identifying an #SF novel I read decades ago.
The main characters each possess some sort of device which gives them essentially infinite power. They use it to create and destroy whatever they want, to travel all over the planet, basically anything.
They don't understand how the devices work. Turns out they're connected to giant machines—maybe originally for terraforming?—that are starting to break down, and the knowledge of how to fix them has long since been lost.

#scifi nerds, I need your help identifying an #SF novel I read decades ago.
The main characters each possess some sort of device which gives them essentially infinite power. They use it to create and destroy whatever they want, to travel all over the planet, basically anything.
They don't understand how the devices work. Turns out they're connected to giant machines—maybe originally for terraforming?—that are starting to break down, and the knowledge of how to fix them has long since been lost.