|Creator||Hayate Yagami (AI)|
Reinforce Zwei (Unit Base)
|Magic system||Ancient Belka|
|Japanese name||アスティオン |
|First app.||ViVid (ch.19)|
|Voiced by||Kana Asumi|
Asteion (αστειον) means "refined" in Greek. This name originally belonged to the stillborn baby of a pair of snow leopards belonging to Claus Ingvalt, Einhard's ancestor, and was picked by Olivie Sägebrecht.
Einhard has nicknamed her Device Tio (ティオ Tio). Wendi Nakajima has also nicknamed Asteion Neko-nyan; neko is Japanese for cat while nyan is a combination of nya (Japanese for "meow") and Japanese honorifics.
It makes its debut in the house of the Yagami family. Its outer coating, designed by Agito, resembles a plush snow leopard, honoring the snow leopards of Shutra that were bred as soldiers and fighters by Claus' family. Upon its first setup, it changes the hairstyle of the adult-mode Einhard.