Because of the southern empire's achievement,the rest of the three empires also sent half their royal knights to challenge the tower,they succeded as well,but never returned.
Search parties were formed to look for them thinking they might have runed away with the treasure's they'd gained,hoping to monopolize them.
They searched around their empire and other empires but to no avail,it was later then discovered that each force from every empire sent into the tower's never returned.
Realizing the gravity of the situation,each empire placed a ban on their tower's,restricting all access and forbidding anyone from entering,this continued on for 100 year's.
As time went on,the world under went huge changes,most people died,new were born,even some royalties died,but the king of each empire still lived albeit they lived in seclusion keeping themselve's out from worldly affairs.
The world progressed and 7 continents were born in these hundred years,the people's who had power,lived with their king's on their secluded land,whenever there is a monster,they will be sent to deal with them,as time went on people living on earth forgot about the existence of superpower's and they all became myth's and fairytales for them.
Even the four tower's were regarded as government property with some secret research going on there,and that's why it has been labelled restricted,some called them Area 52,51 and the rest.
A hundred(100) years later,everything came unto light,the so called myths and fairytales came to life.
Then it all started,around this time,monster's supposed to be inside the tower's were spotted outside frequently,at first it was easy to deal with because they were mostly only one or two,but as time went on these number's multiplied,some even numbering abot 20 with an A-Rank monster leading the group,all these monster's were spotted around the smaller cracks.
After another 100 year's later,there was it,the world announcement that sent shiver's to everyone,dread evident on the face of everyone residing on earth.
*Tower's have been unattempted for 300 year's,monster's have overflowed the dungeon.Tower's are in risk of getting destroyed.*
*Activating potective measure,019.Release all monster's to prevent them from wrecking harvoc in the towers**DUNGEON OUTBREAK,DUE TO OVERLOAD OF MONSTER'S IN THE TOWER,THEY SHALL BE RELEASED,DANGER RATING:SSS*
It took all the empire's best royal knight's to band together to defeat one S-Rank monster,even with that,the number of casualties were astronomical,so now, how were they supposed to deal with an S-Rank and SS-Rank monster's.
As the monster's were released,wherever they passed,turned into a complete waste,this time the threat was labelled as a world threat.[1]
Nuclear,Atomic and even Hydrogen bombs were deployed but it couldn't even scratch the bodies of the S-rank monster's,the monster's still persisted and kept advancing,the threat became a World-Level-Disaster as four continent's had been lost.
[1] A threat/danger capable of destroying the world