Nobody knows when Tethys, the world, was born. And the question, who was the real creator, still stands. Was it The Titans or The First Gods?
The world is created by the The First Gods and with it Titans. Only one side can win this war.
Start of the First Age (1st Age, The Titan War), where The First Gods create Tethys and the Titans are born. The war was unavoidable.
Nobody knows when Tethys, the world, was born. And the question, who was the real creator, still stands. Was it The Titans or The First Gods?
The Titan War truly begins, when The First Gods aim their weapons against the Titans. First to make a move is the Translusent Traveler, who shoots at the God-Killer but The Diplomat intervienes, trying to stop the conflict before it has begun. Unfortunetly, he is incinerated and the other Titans retreat, while the God-Killer is imprisoned.
The First Gods kill the God-Killer in his prison, sparking anger in many Titans. Those convinced to peace - The Elder and Elohim retreat to never be seen again.
A great battle ensues between The First Gods and the Titans, creating a huge rift between lands. During this moment The Leader/Warrior sacrifices himself, so the other Titans can deal a devastating blow to the Gods, who are forced to retreat for a long period of time.
Atlas hid from the Titan War before it even began and offers his services to The First Gods. Marked by many as the Betrayer Titan, he awaits the moment the Gods must use his knowledge to win the war.
The Sunlord tries his best to convince the lonely titan Patient One to submit, however, the titan is master of planning and sees what is going on in the land. Denounces the Sunlord arguing that while he comes to him, his allies steal their mortals by extending the worship to death and magic, increasing the domain of the Gods tenfold.
The First Gods try their best to convince the Titans to surrender but alas some aren't convinced. During the talks, Patient One and All-Father strike against the gods, only to be surprised that the Dragon Mother and Great Mother aren't helping them. Outnumbered, the two Titans are imprisoned, while the rest scatter.
During the Titan War, the Sunlord uses his powers to blacken the skies of non-believers, showing his mastery of the life-giving sun rays. Many flock to worship him, denying the Titans their numbers.
The First Gods try to imprison Father of the Forge in a trapped volcano, however, the titan Caretaker intevienes by flooding it with seawater.
Due to the amount of Titans, Vecna enlists the help of Atlas to kill the Titans: the Father of the Forge and the Caretaker.
Atlas showed his true nature and betrayed the Gods, seriously wounding them. His ultimate plan failed.
The Gods united and chained Atlas into the planet's north pole. There he holds the weight of the celestial bodies.
The Titan Chronos appeared, everybody - God and Titan alike, didn't remember his disappearance in the first place and they would forget it again. His kin was either slaughtered or imprisoned, in anger he used his powers to create the Divergence. Where all would forget about the First World and that the The First Gods were the heroes. This would shape the world in a new timeline. This event in itself would be forgotten until Chronos' return in the Fifth Age, Current Age.