A Swordsman mainly fights with pure brute-force. They have skills that can weaken enemies or strengthen themselves while still attacking. They can also sacrifice defense or HP for even more brutal attacks.
The Blademasters are used to fight with armor in the battles, so they can't move as quickly as the Fencers. However, the Blademasters emphasize on fencing skills that cause huge casualties, which cannot be done by the Fencers.
In order to defeat enemies in the shortest time, the Blademasters are willing to sacrifice their lives. But they usually cause astonishing casualties and therefore often play the role as major attackers.
The qualification requires you to defeat the Blademaster Careers Advisor located at the Dojo in Eversun City (X:162 Y:177). She does have high attack power but a level 10 commoner can survive her hit. She has 572 HP and rarely uses Roaring Lion. If you leave the Dojo while fighting her, you fail the qualification.