Celestial Weapon

Masamune is a Celestial Weapon and it is the most powerful weapon for Auron in the game.

Auron holding Masamune

You must obtain the Celestial Mirror before you can obtain or create any of the Celestial Weapons. Click on the link below for more information on how to obtain the Celestial Mirror:

In order to create the fully powered-up Masamune you will need to obtain the Masamune weapon itself first, then use the Mars Crest and the Mars Sigil to power it up.

Obtaining Masamune

The first step to obtaining the weapon is to obtain the Rusty Sword. Make your way to the Calm Lands and then north into the Gorge.

Head down towards the entrance of the Cavern of the Stolen Fayth and follow the trail off to the right from here. The Rusty Sword is located at the end of the pathway. Use the screenshots below to help guide you.

The location of the Rusty Sword in the gorge
Grabbing the Rusty Sword

Now you need to find the Statue of Lord Mi’ihen.

Take the Rusty Sword to Mushroom Rock Road. Note that you cannot select “Mushroom Rock Road” from the airship menu as this will lead you to the secret area where Godhand is or was located and you cannot get to the Statue of Lord Mi’ihen by entering from the Mi’ihen Highroad.

If you attempt to go this way without treading carefully you may also be ambushed by the Dark Magus Sisters. This will only happen though if you have already obtained the Magus Sisters Aeon. More information about the Dark Aeons can be found in the Dark Aeons side quest section.

Travel to the Djose Highroad instead. Walk westward until you find a stack of crates leading up onto the ruins. Follow the pathway southward.

The path to the Mushroom Rock Road from the Djose Highroad

Continue along the path until you see an area jutting out to the north. Follow the pathway in and you will find an elevator. Take the elevator up to find the statue of Lord Mi’ihen.

The elevator that leads to the Statue of Lord Mi’ihen

Press XButton near the statue to use the Rusty Sword which will cause a glyph to appear on the far wall. Press XButton near the glyph to cause the Celestial Mirror to react. The mirror will glow and you will receive Masamune.

You must now find the Mars Crest and the Mars Sigil to power up Masamune as by default it will only have the No AP auto-ability making it utterly useless.

The Celestial Mirror reacting near the Statue of Lord Mi’ihen

Mars Crest

Double check your inventory before you do anything to see if you already obtained the Mars Crest. It would be located under the “Key Items” tab.

If you did not obtain it during regular play through of the main story, start off by traveling to the Mi’ihen Highroad. Rent a Chocobo from the lady standing outside of Rin’s Travel Agency. Follow the Highroad along until you reach the North End where the gate is located (shown in the screenshot below.

Renting a Chocobo at the Mi’ihen Highroad
The pathway leading to the oldroad

Turn and head southeast down the small pathway. Follow the road along until you reach the end of the path where you will find a treasure chest. Open the chest to obtain the Mars Crest.

The treasure chest containing the Mars Crest

Mars Sigil

The Mars Sigil is obtained as a reward from the man at the Monster Arena. In order to receive it as a reward you will need to complete a total of ten “Area Conquests” or “Species Conquests”, or a combination of the two adding up to 10.

To unlock an “Area Conquest” you need to find each fiend in an area. To unlock a “Species Conquest” you need to capture at least one of each species, such as all of the dragon-type or all of the bird-type. Check out the Monster Arena section for details:

Return to Macalania Woods to the area where you received the Celestial Mirror once you have obtained both the Mars Crest and the Mars Sigil. Offer Masamune up twice to fully power it up using both the Crest and Sigil.

Tidus offering up Caladbolg in Macalania Woods

Masamune has the following abilities when fully powered up:

Break Damage Limit - Allows Auron to do more than 9,999 damage in a single attack
Triple Overdrive - Charges Auron’s Overdrive at triple the speed
First Strike - Allows Auron to attack as soon as the battle begins
Counterattack - Allows Auron to counterattack any regular attacks