Adding the 
No Encounters auto-ability to one of your character’s equipped armor will allow you to avoid random fiend encounters as you move about through Spira. You only need to have the ability on one of your characters, not all three, so you only need to customize one piece of the No Encounter Armor which you can hold on to for the remainder of the game.
This auto-ability is extremely important for a number of the side quests. It also makes completing the end game content much easier and faster and is a necessity for the later stages of the game.
There are a few ways to obtain the No Encounters auto-ability which are listed below.
Purifying Salt (easiest method)As mentioned above, the easiest method is to find and capture the Drake-type enemies located throughout Spira. You will need a minimum of four of each.
Make sure that you have initiated the Monster Arena side quest and that you have obtained Capture weapons for your party. Check out the Monster Arena side quest section for additional information:
The first Drake is called a Vouivre and it can be found along the Mi’ihen Highroad (Oldroad):
The second Drake is called a Lamashtu and it can be found along the Mushroom Rock Road:
The third Drake is called a Kusariqqu and it can be found in the Thunder Plains:
The fourth Drake is called a Mushussu and it can be found in the Sanubia Desert:
The fifth and final Drake is called a Nidhogg and it can be found along the Mt. Gagazet Mountain Trail:
Return to the Monster Arena after you have obtained at least four of each and you will receive 99 Purifying Salt as your reward. You can use the Purifying Salt to customize one of your armor with the No Encounters auto-ability.
