You want to beat bosses form Undervoid Alone? OMG.
Well, they can kill you with 2 hits, and Blademasted have no healing skill, so you should add thief enchants for all pieces and pray for your god.
this is tryed, it can stay alive for lets say 2 mins but blademaster is not based only on thief ... i want to try something new fighter combined with thief luck etc... EVEN pirate stays more with full thief but the DAMAGE ITS SO FREAKING LOW..