(Blue Moon) Hundred-Faced Arsena

Lore
Beneath the light of the moon, Arsena's skin changed once more. At times, she was an angel; at others, she was a demon. Those pursuing her could never guess if an unassuming bystander was their true target. Her identity and motives were ever an enigma for she was only apprehended -- or befriended -- by those of equal ability.

Acquisition
Evolve 2 Hundred-Faced Arsena

Name origin
?

Additional Info
Boss during the Chasing the Green Myth Odyssey Event.