In Assassin's Creed Odyssey you will have to spend a lot of time at sea, for naval battles or exploration because there are many things to do in the Aegean Sea. However for the most diehard among you, an ancient and legendary weapon has been lost at sea and could offer you much more than a damage bonus.
Poseidon's Trident
Poseidon's trident will allow its wearer to be able to breathe underwater, while of course offering you other bonuses that can be found on a legendary weapon.
→ Even if the weapon is too high level for you, you gain its engraving which you can thus put on another weapon and take advantage of the water breathing bonus.
The Trident of Poseidon is found in a legendary chest on the Isle of Poseidon.
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