Reverie

Reverie (《環の守護者》トロイメライ), also known as the Ring Guardian and Traumerei in the Japanese version, is a large and powerful archaism.

Background
Reverie and others like it were created by Aureole as its defence mechanism during the Sealing Plan of the Liber Ark, hence its alias of Ring Guardian. The unit that appears in invaded to destroy the Sealed Area, which was designed to deal away the Aureole, but was halted in its track right before it reached the area's depths since the Aureole was successfully sealed. It was restarted by Alan Richard, who partially lifted the seal.

Reverie is the final boss of. It is an autonomous humanoid weapon sealed (in reality, abandoned) in the Sealed Area underneath Grancel Castle.

In its mode "Eliminate intruders", the main body is supported by Left Forceps (high defence against physical attacks) and Right Forceps (high defence against magical attacks). In this mode, the main body comes equipped with a gun on its head.

Reverie switches to "Genocide" mode after receiving enough damage. In this mode, the shape of its head transforms to imitate a dragon and the forceps join the main body. In addition, it calls forth mechanised drones known as Alpha Drone and Beta Drone. After taking heavy damage, Reverie retaliates with the powerful craft Death Rage.

After a third phase, Reverie's stamina proved too much for Estelle Bright and Alan Richard to decisively beat it. Cassius Bright, who comes in to the rescue at the final moments, finishes his daughter's work.

Dragion
Reverie Dragion is a new version of the machine, created by Ouroboros. The Reverie Dragion is capable of flight, operated by Anguis Georg Weissmann and Enforcer Loewe during the Gospel Plan.