Item	Okeanos Sword
Stats	+140 attack, +60 Style, can be used in battle to cast Oomph.
Location	Cathedral of Blight.

You’ll find the Okeanos Sword inside a chest in the Cathedral of Blight. This optional gear is one of the strongest weapons in the entire game.

Reaching Whitewater Cave

Recommended level: 36

After finding the Fire, Air and Earth Amulets, head back to the Sea Dragon. The Water Spirit will show up, giving you the Water Amulet. You’ll need it to get this sword.

Land anywhere and get up on the Skystone. Head for the Cathedral of Blight, on the small island in the middle of the world. The main entrance is locked, so enter the cathedral through the roof.

Get to the lowest level of the cathedral. The layout is the same as before, but there are roaming minions now. When you reach the prison cell, you’ll see a giant hole in the middle. Jump on it.

Take the stairs down in the middle, then go down on the staircase. You’ll be in a room full of poisonous tiles. Go to the northeastern corner to find the next set of stairs.

Step on the switch to unlock the main door, so you can come back here later. Go down another floor by taking the stairs on the southwestern side, and then take the stairs in the middle. The stairs on the corner lead to a chest with a Pandora’s Box, a stronger variant of the Mimic.

There’s a chest with a Mini Medal to the north of you. Take the path south and go down to the next floor. You’ll arrive at a room full of teleportals.

If you want to quickly exit this floor, take the first teleportal, then do them in this order: north, east, west, northwest, and the one on the northeastern corner. 

Go down two floors and you’ll reach an area that seems organic. Take the entrance to your right and follow the path until you reach the exit on the northwestern corner.

This room has many giant eggs. If you break them you’ll fight a random minion. Go to the northeastern corner to find the exit. You’ll need to break at least one egg to get through.

After a couple of straight hallways, you’ll be in a rectangular room with a pool in the middle. 

If you step in front of the pool and use one of your elemental amulets, a different entrance will show up, depending on what amulet you use. Use the Water Amulet to enter Whitewater Cave.

Getting the Okeanos Sword

Recommended level: 35

After using the amulet, you’ll be in a flooded room. Head north and in the next room, go north and northeast until you’re out of the water. Follow the path and go down the stairs.

There’s a bifurcation here with two different paths. The path west leads you to a Mysterious Fragment. Take the path south and go down one floor.

There is a teleportal in here. Don’t step on it! It will lead you to the final boss in the story. Ignore it and walk north through the waterfall. Open the chest in the middle of this room to find the Okeanos Sword.

Congratulations! The Okeanos Sword is yours. This sword is one of the strongest weapons in the game. It has the second-highest attack value in the game and does an extra 50% of damage as Zap on every attack. You can also use it as an item to cast Oomph.

Now that you have the sword, you can go back and step on the portal to fight Orgodemir, or you can cast Evac to go back to the start of the dungeon. Going back to the start and using the other amulets will let you find the other pieces of the Saint’s equipment. It’s heavily recommended to have all four pieces before fighting him.