I would assume that's either 霊符「夢想封印 散」 Reifu "Musou Fuuin San" Spirit Sign "Fantasy Seal -Spread-" (or its variation) or 霊符「夢想封印 集」 Reifu "Musou Fuuin Shuu" Spirit Sign "Fantasy Seal -Concentrate-" (or its variation) And this scene may be a reference to the Imperishable Night's dialogue, about maddening Moon.