Fall of Onth'Thalas

The Fall of Onth'Thalas (7 Coráre S146 - 15 Lótesse S147) is a conflict that took place throughout the Kingdom of Onth'Thalas. It was fought primarily between the Thalassian Elves and their Human allies against the invading Ataranic Empire.

The battle was the result of the fall of two other Zemurian nations of the Kingdom of Arracourt and the Theocratic Kingdom of Septia. Onth'Thalas was decided to be the last nation to be invaded by Ataranic command due to the want of not letting the Thalassian Elves to escape and reinstituting them to their cause. During the battle, there were attempts by the Ataranic Elven to persuade captured Thalassian Elves to rejoining with their kin, but unfortunately, all refused, citing that they lost their livelihood because of them, and most had not forgotten when the Ataranic Elves exiled their ancestors from their ancestral lands.

On the other hand, then-Thalassian King Revalor Suntorry had already known that the Ataranic Empire was coming for his people, hence he immediately ordered his brother and former enemy, Hadvar Suntorry to evacuate as many of their people as possible. This miracle came to be known as Hadvar's Miracle. With the help of Hadvar's forces along with humans of Orus Dei and the Veldrun Border Force, they successfully evacuated 90% of Onth'Thalas' populace to the east to either Mondstadt or Veldrun.

The Thalassian Elves, despite putting up fierce resistance, were slowly forced to withdraw to their capital city of Silvermoon. The Ataranic Forces were shocked to find that the people they came to "reintegrate" into their society were not there. Out of frustration, Hloirëon Andúnener immediately ordered his forces to capture Silvermoon, control the Sunwell, and have Ataranic Elven Mages to redirect the Sunwell's powers to his own army. Knowing that they would come for the Sunwell, Revalor, Dal'nath Everwind, and a handful of the elite Blood Knights made their stand at the Isle of Onth'Danas, while the remaining Silvermoon defenders came under the command of Leth'Nian Autumnwind. Revalor made one last request to his brother before he departed, and that was to detonate the Sunwell from the safety of the Redridge Mountains. Initially, Hadvar refused but saw it as the only way not to let the Ataranian Elves secure the fount of power for themselves.

As Revalor made his final stand, Grand Magister Dal'nath activated the powers of the Sunwell, such that it would be catastrophic enough to destroy it. As a large glowing light emanated from where Hadvar stood at the mountains, Hadvar casted a spell which detonated the power of the Sunwell as his closest friends and the successors of those who stayed watched as Hadvar stood and casted the spell. The explosion created a large fire which incinerated anything as far as the Thalassian Pass, and left an infernal blast, which voided the entire Thalassian peninsula of life. Following the event, Hadvar and his colleagues departed for Veldrun, where Hadvar was crowned as King of Onth'Thalas.

Despite several attempts to build settlements in the destroyed Onth'Thalas, the Ataranic command realised that the Sunwell's destruction released a highly dangerous magical blight that killed anyone trying to walk into its lands. Because of this, the Ataranic Empire deemed the Thalassian Peninsula uninhabitable and moved on to attack Mondstadt and Veldrun.