Yojimbo: In the Calm Lands, circle past the right side of the bridge leading to Mt. Gagazet, and descend into the gorge below. To the left of the Save Sphere is the Cavern of the Stolen Fayth. Proceed through the cave until you encounter a spirit. Defeat Yojimbo and speak to him to negotiate a fee for his services.

Anima: Go to Baaj Temple with the Airship. Dive into the water and fight Geosgaeno. Defeat it and swim toward the underwater temple entrance. Approach the six statues on either side. There is one hidden item in each of Spira's six Cloisters of Trails. You should have five of these items, now get the last one from Zanarkand Dome. Solve the puzzle there and return with the last item and get your prize Aeon.

The Magus Sisters: Capture all of the required types of fiends on Mt. Gagazet and return to the monster arena and get the Blossom Crown. You must possess all other Aeons, including Yojimbo and Anima. Next, go to Remiem Temple. Defeat
Spathi, and receive the Flower Scepter. After defeating all of the Aeons at Remiem Temple, use the Blossom Brown and the Flower Scepter on the door in the back to unseal it and acquire the Magus Sisters.