Stefan is a special Swordmaster. You can unlock him on Feral Frontier. To get him you need to move Lethe or Mordacai to a square in the yop right corner.
Starting from the top right corner, move three squares to the left and one down - Stefan will appear. If you move there with one of your two laguz he will join your party.
If you move there with any Beorc he will appear and give his S-level swords called the Vague Katti. If you recruit him he comes with the sword.
Added by: V.I.R.U.S.404 Jan 22nd 2006, ID#5248