>>534547350
Beast as in Beast attribute, which is

Koyanskaya of Light
Kiara Sesshoin
Koyanskaya of Dark
Draco
Space Ereshkigal
U-Olga Marie

Solomon (Boss)
Tiamat (Boss)
Goetia (Boss)
Kiara, Koyanskaya and Kama boss fights in their relevant events
Olga Marie fights
Camazotz
Lahmu
Dracos draconic beasts
Demon God Pillars

Note that playable Tiamat is not Beast attribute.