[Mythril]

Hilda teaches you the [Mythril] keyword after you return from Fynn with the Ring.
Compare [Mythril] to other Keywords
[Wild Rose] [Dreadnought]

Related

Infiltrating Fynn

The Rebellion
Page 2
The party sneaks into Fynn and makes contact with Scott.

Salamand

Mythril
Page 2
Josef reveals that his quest for Mythril has gone poorly, with the men of the town captured.

The Snow Cavern

The Dreadnought
Page 3
Using the Snowcraft, the party finds the Goddess's Bell in the Snow Cavern.

Kashuan Keep

The Dreadnought
Page 4
Using the Goddess's Bell to open Kashuan Keep, the party finds Gordon and obtains the Sunfire.

Mythril

Found In Semitt Falls B5
The Mythril is a nice Key Item, for two reasons. First, it allows you to start buying Mythril arms, which are quite good. And second, it's a rare Key Item that actually disappears from your inventory once you use it. Huzzah!

Mythril

Description Might be of some help to you...
Found in Old man's house