"Monsters are real, and ghosts are real, too. They live inside of us, and sometimes, they win." - Author Unknown.
After many weeks of arguing and debating, threatening and what have you, an agreement was made among the more important figures of each Realms. They'd known the plan to separate each Realm was something that had been conjured up and improved for over a millennia, and finally that plan had to come to fruition.
Each Realm was to cut all links to one another through Moot Points, leaving the locations of the remaining ones to only a trusted few. The Wardens oversaw the majority of this, aiding in moving natural magical sources to their own Realm for safe keeping. There had been a reason the Wardens had been mainly Wardens for many years, and now was their time to step up and issue the finality once everything was complete.
With many of the magical outlets finally in their Realm, Earth had been cut off completely -- no Moot Points were to remain in order to keep the humans as safe as possible from any attack. Humans were often non magical by birth, only carrying the genes if they were crossed with a species from another Realm and so could not properly defend themselves against stronger, more aggressive foes. So locking all entrances seemed like the best hope for them and the other Realms. One would believe that the human race would proudly embrace their solace, passing down their stories of far and magic and other remarkable adventures they'd had to places not of this Earth --
Only the people of the other Realms often seemed to forget that the humans, for as much as they hunted and foraged, built and moved further into the unknown, did not live out the long and tedious years as other Races did. Many human Wardens of pure lineage had been lucky to live two hundred years at best, due in part to the excess magic they often held whereas it wasn't as uncommon for people of other realms to exceed thousands of years.
And so, while the other Realms say and waited for the day they could one day reunite the Realms and bring back the days of old, humans slowly carried on, forgetting the magic and their duties -- instead turning nonfiction into bedtime stories and scriptures alike. The natural reservoirs that had been hidden in varying crevices of the Earth, waiting for the day someone would stumble upon them, becoming forgotten as generations of people moved about their daily lives and yet, all seemed peaceful in this mandatory solitude --
Until the moment seemed right to strike.