The lost prophecy for the two realms

Day 256 of this journal:

I’ve searched everywhere? Where could it be, damn it! I’ve read a thousand times the journals from Gradneir, the Mage who created the barrier around our realm. I know he had doubts about what he was doing. Doubts so strong he explicitly said he kept secrets from the king at the end of his life. Though his life has been short after he completed the spell. He said the magic took a toll on him, that the water flowed directly into him and robbed him of his energy. I can’t imagine what it would be like. I’ve never actually been in the river since it’s “sacred” now. I’ve learned from him that the water hasn’t always been white and glowing. Once upon a time, it was normal water. Apparently, the magic transformed it, and the land too. I wonder how the other side of the water is. Is it also white like ours, or is it natural? Are we the only one trapped? Gradneir believed the Two Realms were identically enclosed in his magic, but he wasn’t sure.

Day 258 of this journal:

I went back to Gradneir’s old office today. I’ve been there so many times, already but I keep hoping. Lucky for me the old Mage is still revered today. Their superstition is my gain. I don’t know how I could have missed it before, but I’ve found a secret cache. It wasn’t big, but there were so many things inside. I will take me weeks to explore what I have found. Maybe months. And still our kingdom is in danger. Yesterday, I had to tell some villagers that I couldn’t distribute more food to them. Their land is dry, blackened.

Day 265 of this journal:

I’ve spent almost a week trying to decipher the old manuscript from the old fool. And I’ve finally found something of interest. A white paper, preciously hidden in the cover of a book. I’m guessing it is not actually white, just that the text is hidden. I have to be careful about this. I have a good feeling about this one. It might be the answer to my prayer. It might be the prophecy that he’s supposed to have left behind.

Day 267 of this journal:

I can’t find a way to reveal the text. The only thing I haven’t tried is fire, because I’m afraid to burn it down. The paper is so ancient and thin. But I might have to try, this might be my only chance. I have to do something. Things are worsening everywhere and my father doesn’t seem to notice anything. He just trusts his religious advisers, a bunch of useless devotees!

Day 268 of this journal:

Today, Lancero started to feel sick. Or at least I think so, he didn’t want to eat at all. Even my dragon isn’t out of reach of this curse. I have to do something, and soon.

Day 269 of this journal:

Fire was the answer! I have found the prophecy! Now I have to understand it.

Day 273 of this journal:

I’m useless. I can’t figure out the words!
The open-minded souls. What does that even mean? Accepting the other side. The other side of what? Why do all Mages have to be enigmatic?
And Lancero is getting worse. He barely eats now. I can feel the hurt he feels. I’m useless! I think I need help to figure out the old fool’s riddle, but who could help me? Who will?