- Darius is the father of Shahenshah (King of Kings) Xerxes I of the Persian Empire.
- The Persian origin of the name could be related to Darius being a Laquerarii (a type of gladiator that wields a lasso), such gladiator type was inspired in the fighting style of an ancient Persian tribe, the Sagartians.
- Guardian Beast Darius has the appearance of a humanoid horse.
- This monster is holding "Gladiator Lash".
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