Atsuko Tanaka
is the one who established Class Zero. Though she appears human, Arecia is a being who serves the deity Pulse and is responsible for the creation of Orience's crystals. Arecia's purpose was to use the powerful souls among Class Zero to locate Etro's Gate in an endless cycle of conflict, but the events of "Type-0" have Arecia end the experiment and depart to points unknown. Before she leaves, she frees Machina and Rem from crystal stasis. Arecia is voiced by Eliza Jane Schneider in English and Atsuko Tanaka in Japanese.