Getting cut off from the knights' magic rock also required a period of exile from their giant glass mushroom. (Those of you in the Hushlands, I dare you to work that last sentence into a conversation. "By the way, Sally, did you know that getting cut from the knight's magic rock also requires a period of exile from their giant glass mushroom?")
Brandon Sanderson (2016). “The Knights of Crystallia: Alcatraz vs. the Evil Librarians”, p.127, Macmillan