>>279878894>Like this?Wasn't that a "last-second eldritch monsters to justify ending up the power fantasy"?
The problem with Fantasy vs Modern is to build up a proper multiverse
-that can't be outsmarted by a preschool
-that don't make the modern side obviously superior to the fantasy one
I don't think it's especially hard. Like having both world suffer destruction as long as gates plural are open, fighting cults on both side keeping them open.
You just need to plan for that before you make the plans for your fantasy harem.
Also harem are boring as fuck, just learn to write more than one MC.