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Sword Art Online Volume 18, Yen Press release
Yui: "Which would mean that this address points to..."
 * Originally a mental health counseling program from SAO. The greatest top-down A.I. in the world.

Kirito: "Alice, this is the way...This is the path that leads to the Underworld!!"

Alice: "In other words, this is how we can go—I mean get back. To that world...to my world..."
 * An Integrity Knight of the Underworld. The Priestess of Light, whose fluctlight broke through its own limitations.