Legendary Items include Legendary weapons and armor sets in Greedfall. These weapons and armor are the best and most powerful of the game. They deal high damage and provide great protection but as expected, are tough to get.
Legendary weapons and legendary armor sets in Greedfall are to either found in a hidden chest or after you have fought a boss. You might get a key for these hidden chests and then you can open them.
GreedFall Saber of the Sea People Location
This one-handed heavy weapon with a maximum Strength requirement can be found at the mine of Cwenvar, “The Tall Trees” in a chest next to a jail cage. In order to gain access to the mine, you need to progress through “The Blood Prince” quest.