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.