There are 5 different levels of Sword Mastery, each with it's different advantages.

Newbie (*) - can only use simple slashes and jabs (1 sword only) (auto. after getting a sword)

Novice (**) - can use simple slashes and jabs and can also learn Lvl 1 attacks (1 sword only) (5 days to reach)

Warrior (***) - can use simple slashes, jabs, and Lvl 1 attacks and can also learn Lvl 2 attacks (2 swords can now be used) (7 days to reach)

Sensei (****) - can use simple slashes, jabs, Lvl 1, and 2 attacks and can also learn Lvl 3 attacks (2 swords can now be used) (10 days to reach)

Master (*****) - can use simple slashes, jabs, Lvl 1, 2, and 3 attacks and can also learn Finishing Attacks) (2 swords can now be used) (15 days)