"You have that drone... You say you are an investigator - I gather you do not necessarily mean scientific investigation... Perhaps I should send you to my sister after our conversation. She is, in all likelihood, the person who knows the most about Sheikah technology still among the living. Ahem! At any rate, now to tell my story..."
"Ganon is important to this tale. A primal evil that has returned again and again over the ages. He has been turned back time and time again by a warrior bearing the soul of a hero and a princess carrying the bloodline of the goddess... Ten thousand years ago, the land was at the height of power and technological progress. It was then that the Divine Beasts, the automated army of Guardians, and the ancient shrines and towers were created. The Divine Beasts, piloted by four champions, and the Guardians worked with the hero and the princess, and successfully sealed away Ganon. But at the last moment, Ganon's influence lashed out and corrupted the Guardians and the Divine Beasts. They became lifeless, useless. And so the time of prosperity came to an end, with no technology remaining in working order."
"One hundred and twenty years ago, growing increasingly worried about the prophecies of ruin spoken by sages everywhere, King Rhoam ordered the formation of a research institute. We were instructed to excavate sites likely to hold ancient Sheikah technology and devote ourselves to understanding it... Whatever effect the legend speaks of, where Ganon had disabled Sheikah technology, seemed to be gone. We made rapid progress. Uncovering the army of Guardians, uncovering the four Divine Beasts. We learned to control them, learned a little bit of the ancient thinking machines. We arranged for a mighty champion to learn to pilot each Beast, and we identified the hero and the princess foretold by prophesy. Everything seemed to be in order. But we were overconfident... When Ganon arose once again, one hundred years ago... He did not merely disable the Guardians and Divine Beasts, he took control of them, turned them to evil ends. The four Champions were slain. The hero fled the battle with grievous wounds, and was brought to a place of healing, and the princess..." She shakes her head.
"The army of Guardians spread throughout the land, destroying everything in their path. Legions of monsters rose up, more than ever before, and aggressively attacked anyone they could find. The knights of Hyrule fought bravely and well, but in most places there was little they could do. Guardians are terrifyingly fast and boast weapons that can blow stone walls to pieces with little effort. The knights somehow held a line of defense at Fort Hateno, and another at Akkala Citadel. They slew a great many Guardians. Akkala Citadel fell after three days, but Fort Hateno held. Alas, everywhere else defense was mostly futile. Millions died. Hyrule has yet to recover. We called this the Time of Burning Fields."