Auron's Masemune:
On the way to the Cavern of the Stolen Fayth, after passing under the bridge, go to the right and follow the path until you reach a sword in the ground. Take the rusty sword. After getting the airship, return to Mushroom Rock Road. Follow the path that was blocked by guards before until you reach an elevator rock. Place the rusty sword by the statue of the man standing on top of a defeated behemoth. The sword will appear afterwards.

Mars Crest:
Go to the end of the Mi’hen Highroad and make a U-turn down the old Mi’hen road. Follow this path down to the end for the crest.

Mars Sigil:
Unlock a total of 10 area and species creations at the monster arena. Obtaining capture weapons as soon as possible will give you a head start on getting this one. See the monster capturing section for further information.

Difficulty: 1/5-Another easy weapon to build. The sigil is not hard to get at all.
Time involved: This one doesn’t take that long either. While doing some other side quests, leave on capture weapons to save time.
Tip: One particular quest is going around and collecting Jecht spheres. In this way, you can obtain all of Auron’s overdrives, as well as his sigil.