User blog comment:Rafe Adler/"The Scar" Discussion/@comment-31057575-20181026202241/@comment-3169324-20181030125830

Lest you forget, alternate Kaia was able to survive in The Bad Place because of the weapon (and her superior fighting skills, obviously). Clearly, it was made for the purpose of killing powerful beings.

Furthermore, to reiterate, it's an alternate universe, with a different history, different rules and rulers, different materials, and so on. An alternate universe, with its own set of laws of physics, could conceivably have materials completely different from anything in our own universe.