You can’t use a dagger with a flurry of blows at all. When
you use the flurry ability, you must attack with either unarmed
strikes or with special monk weapons. Only six of the latter are
included in the Player’s Handbook (kama, nunchaku,
quarterstaff, sai, shuriken, and siangham). A natural weapon
(any natural weapon) is neither an unarmed strike nor a special
monk weapon, so you can’t use it along with a flurry.
FAQ