Elden Ring: Blaidd Questline - The Truth of Blaidd's Purpose with Ranni (see description)

(Please keep in mind this was uploaded on March 2nd. A lot more information has come out about Blaidd's storyline since uploading this video. When I posted this video, no other videos, or even the fextralife page, had documented Blaidd being captured in the Evergaol after Radahn. I'm keeping this video up as a sort of archive to the era of when the game first came out and lore discoveries were still happening, but the information this video has is mostly irrelevant. There is no way to save Blaidd.)
Explanation:
After defeating Radahn, you will converse with Blaidd and agree to meet in Nokron. Blaidd will not show up, and in Mistwood Ruins where you first meet, there will be a note. Iji will have more dialogue about the excuse of Blaidd's absence. In truth, Blaidd has been imprisoned in the Forlorn Hound Evergaol, as a precaution to Ranni's safety. Blaidd is an unknowing servant of the will of the Two Fingers and will instinctively betray Ranni if she strays from her path.

I did not get the option to tell Blaidd of his true destiny, but I'm unsure if keeping him imprisoned will open up different dialogue in the future. I may have messed something up by walking away from Iji's dialogue too soon. Or perhaps I was meant to chose the option to not free him in order to tell him the truth of his purpose. Either way, I missed out on that option.

Freeing him did not stop him from going hostile after obtaining the Moonlight Greatsword. If anyone has more information to share on Blaidd's quest progression, and if it deviates from the Age of Stars ending, please let me know.

(Update March 10th: As of this update, there is no known way to save Blaidd. Blaidd knows of his fate, and knows of his connection to the Two Fingers. He does not think he will go mad, because he thinks his loyalty to Ranni is stronger than his fate to betray her should she stray from the will of the Two Fingers.)