The Symphogear System created from a fragment of the 3rd relic, Gungnir.
Previously worn by Amou Kanade, it has been passed down to Tachibana Hibiki.
Normally, when a Symphogear is disengaged by the user, the energy levels will stabilize and it will reconfigure into a form resembling a pendant. However...
At the time of the concert tragedy, fragments of the Gear were embedded into the area near Hibiki’s heart.
There they remained, eventually fusing with her body.
As a result of assuming the duties of an Adaptor and repeatedly engaging the System,
the fusion continues to spread like a cancer, altering Hibiki's body.
It is believed that Hibiki's signature explosive power, resilience, and accelerated recovery rate are all likely due to her fusion with Gungnir.
The third relic, which provides the base of the "Gungnir" Symphogear worn by Tachibana Hibiki.
The Gear was made from a fragment of a mighty spear, which in Norse mythology was wielded by the god Odin.