Edit April 19, 2018: I am turning this suggestion around with my enhanced experience. I will put the old version in a spoiler.
The librarian NPC will come to a house with a bookshelf. It may be also put as a different guide function. It will tell the stories of old.
So, if forum ideas came to terraria, their would be a lot of stories to tell for things like Chacme, the alternate WoF. So how about a librarian or another option for the guide? It would tell the new forum creature's stories, or maybe some other one too.
The three gaurdians, after being defeated were repaired and made stronger by the cultists. They will return someday, stronger and angrier, tearing through the night seeking after metal figurines imbued in aincent magic, killing any who stand in their way.