Sanzu River
Serrator's plan is finally revealed in the episode "A Crack in The World" where Kevin notices how all his attacks form a straight line on the map. Serrator reveals during his next attack his true motives are to crack open the Earth so that the entire Sanzu River floods in, trapping Master Xandred in the Nether Worlds and heightening Serrators power to the point where he is equal to none. This will allow him to become the ruler of both worlds as well as create a new domain of his own.