Crystal Cage (クリスタルケージ Kurisutaru Kēji) is a [[:Special:Ask/-5B-5BCategory:Spells-5D-5D-20-5B-5Bspell-20category::-5D-5D-20-5B-5Bspell-20type::-5D-5D|cage-type capture]] spell, generating a pyramid-like magic cage to imprison the opponent. The one being captured cannot use any mana resource. It is first seen in A's cast by the Masked Men to keep Nanoha and Fate out of their way as they kill the Wolkenritter to turn them into pages for the Book of Darkness and force Hayate to have a mental breakdown. In appears in::StrikerS, it is also cast by Nanoha upon Vivio aboard the Saint's Cradle.