>>7791
>What exactly does it do other than produce prophecies?
It doesn't produce prophecies, it is used in the same general manner that a normal scroll would be used for.
The Elder scrolls exist outside of time and record everything which occurs within time.
When someone reads a scroll they may come across a significant record from the future and perceive it as prophecy, but in truth, that event has already happened, just like everything else in time.
Like Zurin Arctus says;
>Each event is preceded by prophecy. But, without the hero, there is no event
>Where did they come from?
Magnus. They were originally formed from, what can assumed to be, the blueprints of the world.
Magnus feels remorse for abandoning Mundus and the Elder Scrolls are his way of looking back on the world. They are gathered and delivered to him by the Mnemoli during Dragon Breaks.