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|Light Novel|| Volume 8 (mentioned)|
Volume 10 (actual)
Asterius (アステリオス) is a Black Rhinos Xenos.
- According to Asterius, he named himself Asterius, meaning lightning, because of the crimson lightning he saw at the end of his dream, which was Bell's Firebolt he used during their battle in volume 3.
- Asterius is the name of the Minotaur of Crete in Greek mythology.