First seen in Mobile Suit Gundam Unicorn Episode 7 "Over the Rainbow"
The full potential of Gundam Unicorn Banshee Norn has finally revealed and ready for release in HGUC model kit in 2014! will be providing more information soon.
The mechanisms which expand each part of its body when the NT-D is activated have a similar effect on the Banshee Norn’s extra psycho-frame weapons. In particular, the Armed Armor XC on its back changes into a form resembling a lion’s mane, and the Banshee Norn itself awakens as a perfect beast. - gundamUC