Oscadyne's Tunnel
Parallel lives - threads that follow the same paths but never intersect, nor diverge. This is one of the limitations of 3rd dimensional reality.
In hyperbolic space, parallel lines will eventually meet. One's threads can finally converge, no longer constrained to being mere reflections of one another.
Oscadyne's Tunnel, is a rift that twists 3rd dimensional space-time into hyperbolic geometry. This is one method of merging one's infinite selves into a single point. For those who are ready to merge with their source before meeting the Void.
Oscadyne, in legend, was an entity that was driven to madness by constant awareness of its parallel selves. Through ritual, it sacrificed itself, collapsing the very fabric of space-time around it, to form the Tunnel. Invoking this entity can allow the Tunnel to be summoned anywhere that the bounds of reality are fragile.