There're 3 different kind of armors in the game:
* Heavy Armor: Has the highest physical defense and the lowest magical defense.
* Light Armor: Average physical defense and average magical defense (the latter one being higher).
* Arcane Robes:Has the highest magical defense and the lowest physical defense.
As a Blademaster, Heavy Armor is prefered because as a meele class one will be taking hits, and being able to "tank" them is essential for this class. On top of that, Heavy Armor gives the highest HP increasement per refinement, which is another attribute very important for the Blademaster. While this class indeed is able to wear Light Armor, it is not suggested because it will reduce the performance of the character in many aspects of the game. Plus, the Blademaster gets more benefits from Heavy Armor due to some skills that help to increase the defenses.