Just before the Clone Wars began, Mace Windu ignored a shatterpoint in the Force.
Sometimes, if you hit a corusca gem just the right way at just the right angle, the whole thing shatters, sometimes violently.
In the Force, to him, anything can be like that. People can be like that - one perfectly-chosen word or gesture is all it takes.
Rarely, the future can be like that for him. The whole structure of time can turn on something, anything: a planet, a person, a feeling, a bad motivator unit, a sword through an old friend's heart.
More rarely now than before. When he was younger, the world would crystallise more often, more clearly, the weak points obvious. Now, like everything, there is mostly grey darkness.
War does cloud the Force. Uncounted trillions of lives cut short all the time, the whole galaxy a cauldron of fear and hate and violence, is like a constant unhealed burn, every moment of every day.
But it is more than that. The Jedi speak little of it: public morale is weak enough as it is, and the Jedi were supposed to be - are supposed to be - the final security of the Republic, within and without. And the truth, that there is something out there powerful enough to cloud the sight and slow the limbs of every Jedi everywhere, all across the galaxy - that could unnerve even younger Jedi, if it got out.
But there had been one shining moment on Geonosis where he saw how the war to come turned on Jedi Master Dooku, how his death at that crucial point would make the Confederacy crumble and the Clone Wars sputter out before they began, and he saw in that moment, and just for a moment, how one fluid thrust with all his strength would slip past his foresight and his defences and his ribcage and save untold lives.
He hadn't done it, and the moment had passed, and that might spell the end of the Republic.
So when, one day, in a brief lull in the intensity of the Outer Rim sieges, he settles to meditate and perceives for one shining moment a vast cleavage plane in the future, one of the biggest he's ever seen, that cuts straight through him and straight through the abandoned and barren planet of Jebble - the sort of break that could make the galaxy something new, perhaps something other than this - he stands up briskly, alerts the clones to his impending brief leave of absence, lets the Force guide his fingers as he enters hyperspace coordinates, and finds himself on the frozen surface of a dead world.
Before him is a gleaming black casket newly thrust out from the ice, without even snow settled on it, looking for all the world like it was polished an hour ago for all that it juts out of ancient permafrost and is inscribed in a lost language of the Sith.
That fracture in the Force leads here, and straight through the invisible joints in the casket.
...He doesn't sense anything inside. Not that it's empty - he doesn't sense emptiness, not the quiet activity of air or the humming void of deep vacuum or the slow hard presence of solid metal - he senses nothing.
Fools have tried, but no mere physical procedure can affect the Force. It's possible to extract and measure and even concentrate midichlorians, but nothing of interest happens when you do.
Some lost archaic Sith, then, made this device, and wanted whatever was inside forgotten and lost.
That doesn't necessarily mean he wants it out, so he palms his lightsaber.
But the shatterpoint leads here and doesn't seem to pass through his own death, and beyond that... he will take a gamble, over the current doomed course the Jedi walk.
He follows those complex lines, and reaches out with the Force, and applies pressure to the casket just exactly right.