No encounter

Don't tell me about Puryfying Salt.
I need this ability from the beginning.
How can I get it so soon?

You can win a weapon with this already added from Geosgaeno. Normally you can only put [No Encounters] on an
armor, but the Geosgaeno weapon keeps the monsters away like the armor.

Geosgaeno is the fiend you fight in Baaj Temple after you revisit it with the airship.

If I got the airship,I'll go capturing fiends,I need "No Encounter " no more.
I saw one friend of mine had this ability very soon,in Thunder Plain.But he didn't told me how.

Err, maybe he went back...

As far as I know, you can't get 'no encounters' that soon...

what do you need it for?