what has happen with the arrival of Abyss

‘Atreia’ is the first world that formed around ‘the tower of enternity ’ and later on is divided into two worlds- the demonic realm and Angelic realm, the ‘Draconic race becomes arrogant with its power growing. The three worlds are not friendly with each other, but they all want to conquer other to be the owner of the whole world. Later on, with the destruction of the ‘ Tower of Eternity’ destruction, the Abyss is created.
The Abyss is a mystery passage between the two worlds-the Angelic and Demonic-created after the great cataclysm. When the Abyss opens up, the two worlds hatred between each other is accumulated and amplified. In addition, secrets hidden from the two world that may allow them to take charge of the Abyss start to be revealed one by one.