You create a 20-foot-radius sphere centered on a point you can see within range, through which you can see a place of your choosing on the plane you currently occupy at any time in the past.

For the spell's duration, the sphere and any space within 30 feet of it are difficult terrain and magically dimmed light. Any creature in this or the conjured time and place can pass through the sphere to the other by finishing their turn fully inside the sphere. When they do so, they take 3d10 force damage and appear in a random space adjacent to the sphere.

To cast this spell, you must be touching either a magic item or a willing creature that existed on the same plane and at the precise moment you conjure.

If a creature passes either direction through the sphere, an alternate dimension is created within the tapestry of time, as both timelines are irreversibly altered. You can access one dimension from the other via the Dream of the Blue Veil spell, though the same amount of time will have passed in both dimensions since you cast this spell. Your dungeon master may determine how someone's abrupt absence or presence in a timeline would alter it.

Any unwilling creature that begins its turn within the sphere must succeed on a Wisdom saving throw or be expelled forcefully into the conjured time and place.

You can undo the effects of this spell with the Wish spell, which creates a third dimension in which the spell was never cast, though the first two dimensions will endure.