The multiverse is a vast and strange place, and sometimes things don't fit. Sometimes there are — loose ends. Sharp edges. Corners. You might think that a corner is a characteristic of physical objects or the space they exist in, but they can be a feature of time, causality, magic, entire universes …
Sometimes corners catch on things.
If one of those things is a particular flavor of the essence of motion, travel, relocation, well, the results aren't pretty. Nor are they where they used to be.
An accidental traveler, a purposeful one, several now-even-more-lost artifacts, the contents of two portable holes, and a chunk of perfectly innocent savanna tumble through non-space for some non-time and crash into…