Sheath Master

You spent years training in both blade and blunt weapons and took an intrest in combining techniques through sheaths, and you learned to use sheaths as an extention of your body for both offense and defence. 

You can use weapons that have a sheath to either inflict blunt/bludgoning or slashing damage by sheathing or unsheathing the weapon. You also have the ability to use a sheath in tandem with a one handed weapon as a makeshift shield to increase your ac equivalent to a normal small shield.