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Assassin's Creed Odyssey features amazing open-world locations and quests, especially within the Fate Of Atlantis DLC. This expansion pack is full of amazing adventures, and a lot of the quests within it have important choices that you can make, including the 'Dark Horse' quest.
Allow Mulios To Keep The Horse
If you allow Mulios to keep the horse during your conversation with him in the Arboretum, then you can't deliver it to Persephone or Adonis.
Deliver The Horse To Persephone
Once you've made the decision to deliver the horse to Persephone's Jockey, you can begin to ride it, which will make your journey much quicker. The Asphodel Fields is your objective location for this path, so you need to ride it there and deliver it to the jockey to complete the quest.
Deliver The Horse To Adonis
There is a character that you can give the horse to on behalf of Adonis. Ride the horse to Minos's Faith and meet with the character who will take the horse from you. Similar to the Persephone route, you won't have to fight more enemies, but traveling to Minos's Faith takes extra time that isn't required if you allow Mulios to keep the horse.
Talk To Persephone
After you've made your decision and finished delivering the horse to the character of your choice, you have to return to Persephone at Persephone's Akropolis and speak with her. You can tell Persephone about what occurred during the quest. Once you've spoken with Persephone, the quest will complete, and you will receive your rewards.