From GameWatcher: “Assassin’s Creed Odyssey has been out for a little while now, but players are still working out how to unlock some of the game’s free DLC content. Out of all the Assassin’s Creed Odyssey free DLC the Epsilon Blade is one of the hardest to get. Here’s how to unlock the Assassin’s Creed Odyssey Epsilon Blade!”
Source: N4G PC Assassin's Creed Odyssey Epsilon Blade: How To Unlock Epsilon Blade