In , titled " The Sage of the Library ," the story shifts from intense combat to a major narrative revelation. After escaping their prison cell, Kirito and Eugeo are confronted by the Integrity Knight Eldrie Synthesis Thirty-one. Key Plot Developments
: Kirito and Eugeo face Eldrie and his Frostscale Whip, which can split into multiple attacking segments. Eugeo recognizes Eldrie as a former champion of the Four Empires Unity Tournament, causing Eldrie significant mental distress as his suppressed memories attempt to resurface.
: Before the battle concludes, a mysterious girl named Cardinal opens a warp gate, pulling Kirito and Eugeo into the Great Library Room within the Central Cathedral.