The Immaculate One

The Immaculate One is the class used by Rhea as her appearance as the final boss in the Silver Snow and Crimson Flower routes for Three Houses. As a monster class, the Immaculate One shares similar weaknesses that other monsters do, including slightly below-average speed and the possibility of an armor break, and the Immaculate One not only possesses a weakness to monster-effective weapons but also dragon-effective weapons. Unlike most monster classes, the Immaculate One takes up a three-by-three space and as such will require more attacks to break its shield. Though in-game they share the same name, there are three variants of the Immaculate One class within the game's code.

Two are used for Rhea's appearance in the Silver Snow campaign; a weaker variant with lower stats, and a stronger variant with higher stats and the ability Surging Light, which allows it to use its Staggering Blow without preparing it beforehand. Both variants have a wide variety of abilities both offensive and defensive.

The third Crimson Flower variant is somewhat more tuned towards raw power and one-on-one combat, with abilities such as Ancient Dragon Wrath, which allows it to hit the lower of its target's defenses, as well as Giant Wings and Wrath.

• Rhea