Rise of Champions

Selas, the north west continent of Valebat. One of the calmest continent in the entire land.
However, there was a law in Selas... No one may pass the walls or gates of Selas.
That prevented any outsiders to come in, or any of the people inside to go out.
A war raged outside these walls, without any of the people's acknowledgement of the war, these people didn't have to strive for survive unlike the others. However, on the opposite side of the realm, a kid named Cian Seclas found a lake while going on a school field trip, with his friends, Rex Spades, P.K., and Aria Redemly.
They eventually noticed a frozen dragon beneath the lake and began panicking, as they raced into a cave.
Kids eventually got lost and found four cups, with the insignia of the four natural elements, with a bowl of water in the middle.
Out of ideas, the kids drank the water from the cups and fainted....
They wake up, to find themselves separated, and in test tubes.
They break out, and exited as the labs as they find out, they are no longer in a realm they knew.
And in order to survive and exceed in defeating the person who wants to kill the kids, they must change their personalities, and their way of living.