Theos : A legendary story

In this novel, There are four characters naming : Augustus Marlowe, Rosalia Windsong, Jackson Peirce and Henrywood Sinclair who discover the new worlds on Titan like Mega Octa World , Deca Gonia World and Zandaros Dominion, in which they have to defeat Zandaros , a great evil. There is also a secret that what's the relation of Augustus with this world.