User blog comment:Themasterofantics/Monster Girl Theory/@comment-24664052-20150326102407/@comment-28144855-20191015194348

It is just how that universe and everything in it operates under localy nominal constants, and why I keep saying DE is hardly a thing outside its verse. Before anyone goes we/them would die upon entry in each others verse/reality, it probably won't happen. As long as they possess some sort of conciesness and/or mindpower/willpower they would not vanish just by being in our universe as said mind/consciousness could keep them anchored to our verse as that too should be a sort of energy. However their magic probably won't work in our universe except in their own bodies, serving as a sort of nexus of their verse. So they would not be able to generate fire, ice or such outside of their bodies as it would vanish when it would broke physical contact with them. An individuall couldbuff itself from 'inside' via some strengthening/boosting magic, but if they mess up even a little bit, they could burn out, quite literally or even cause a big ass explosion. So forget monsterization, forget casting ludicrous spells, flying except if they can generate enough lift and trust the old fashioned way along many more such shenanigans, unless they are literally 'stronger than the sum total of our ENTIRE Universe' which no Mamono or God has proven to be to date, not even as they all unite to cast a single spell. We know their world is vastly different than ours from all what we know is set, it isn't a Paralel universe to ours, It's a fundamentaly differen't one, an Alternate Universe. As it is not an Earth that branched x time ago, It is 'something totally different'.

Or, you'd get an Overly Cautious MamonoHeroine that's totally overpowered and has come to defeat our World leaders and bring freedom to us pathetic Earthlings.

"Donaaaald, Vladiiimiiir!!!! I said my sword was a tool of justice..."