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.