The Spartan Pack DLC is free on Ubisoft's website. Simply sign up for it.
DLC's Description
GET YOUR SPARTAN PACK
As with any offering from the gods, the future isn't always certain, but we are hopeful that the unnamed gifts will bring you good fortune. Redeeming your gift is simple: Register below, and your Gift from the gods will be added to your arsenal when Assassin's Creed Odyssey launches on October 5th for PS4, Xbox One, and PC.
Ancient Greece is waiting, so claim your Spartan offering and get ready to leave your mark in history!
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