When it is shown as an unnamed LEV, Testament boasts weaker attacks and a Soulsection attack that requires twice as much Spirit to execute. It also has bulkier armor and uses an arkjet engine commonly found in LEV's. When it switches to Orbital Frame mode, however, Testament loses most of its armor and switches its engine to the anti-proton reactor commonly found in Orbital Frames. Afterwards, its attacks are seen to be stronger, and the Soulsection attack requires less Spirit to execute and deals more damage.
Secretly tested and built by Dezeele Zephyrs, he and his crew refer to it as the "New Model Animus." "Animus" is Latin for "soul", and at the time, simply referred to the general model that Zephyrs had planned on mass-producing.
Pharsti decides to name the Orbital Frame "Testament", after her agreement to stand by Cage regardless of other circumstances.