DualMirrorverse

This world is just a mirror version of other worlds... Somethings are opposite from the original but no travelers can figure that out because when they enter, all particles of their body turns into the Δ particle and when all Δ particles' energy is lost they just dissolve leaving nothing behind.

Δ particle is the Dual Mirror Particle. Not to be confused with Primordium Delta

How to get here
It is possible though the materials needed is hard to get. To get there, you need 2 100% reflector. Stand between them, and voila! you are there.