|Magic system||Nil (EM Force)|
|Japanese name||ディフェンサー |
It is officially referred to as Independent Floating Shield (独立浮遊シールド Dokuritsu Fuyū Shīrudo) "CWX-Defenser", without any model designation.
Defenser first appears in Reflection. It functions as a shield under the user's control.
Nanoha Takamachi uses two Defensers (personally colored in blue) as option units of her Fortress System. They are usually small-sized, but occasionally she also uses a combination of one large-sized and one small-sized.