@YungManzi Case in point, Elliot, like Suimei he is from a different world than those of the other world, and his ability involves materializing a physical substance.
Magic in the other world=The Elements, thus limited to the 8 elements, there is no magic to materialize armor like Elliot.
Then you get into stuff like Goeta and witch craft, different systems of magicka that exist in Suimei's work, no magic exists that can perform an astral attack in the other world, however Goeta can accomplish that.
Magic=Mystical law ie The Elements, Magicka=Techniques to manipulate the mysteries, the mysteries encompassing all that is mystical in nature. This includes, the wonders and monsters of Japan.
I mean infinite worlds exist and each world is governed by different laws, The Elements being what governs the otherworld, hence why Suimei was nerfed in the other world cause the laws and what not he uses weren't in the other world.
If someone in some other world has some sort of ability, regardless of it's difference from what could be termed as magic, it would still be a mystery and fall under RDE, proven by the fact that even in the other world RDE applies, when it's something that was established to exist in Suimei's world, cause it shuts down the mysteries.