...
As Shin 'watched' the history recovered by the God of Primordial Waters, Hydros, he came to understand that there were still dozens of eras before the Ancient Era that the current denizens of the Atlas World were still looking for clues.
Of course, that was still before Hydros died during these eras, which meant that there was still a huge gap in between that was still unknown.
Shin called this recorded history the 'Mythical Era'. This era was composed of multiple eras during the time Hydros was still alive.
While he was 'watching' the history of the previous world, particularly the history of the Great Ocean, Shin also checked on the other facilities of the Forgotten Temple. But to his disappointment, he did not get that much since all of them were sealed and inaccessible with his current authority.
The Weapon Storage, the Skill and Martial Rapsody, the Puppet and Golem Room, and many others were all locked.