Many of the mythological beings once of your world abandoned The Terrene, what they have come to call your Realm, after the Great Goblin Battle in the year 613.
It was an age of conflict for the human race. They ceased to believe in the old ways of magic and fantasy, Christian religion was on the rise, and humans ordained themselves as the chosen race and tried very hard to dominate the other nations. Dragons, once majestic beings that ruled and protected man found themselves being hunted to the point of near extinction.
With the movement against the dragons, mankind became a very maniacally aggressive race, no longer co-existing with the other nations. They considered themselves the dominant race and organized by the power of sheer numbers to slaughter all nations…even members of their own race that they considered weaker factions of mankind. Arrogant with power they battled for land, for power, for sport. As they plundered through smaller weaker races, man’s ego began to grow to the point that they no longer wanted or needed magic and the creatures of fantasy began to disappear. When such a disturbance upsets the natural balance of things, nature begins to take control by building a new world. Spun from the fantasy and dreams that once lived here, the Netherscape grew into a strong magical realm. Many of the beings of the fantastical world relished the new beginning and they forged a Realm built entirely upon the combined efforts of their diverse populations. There were those, however, who stood with the Goblin congress, determined not to be forced from the realm they loved into a new realm.