The Dark One Cometh: Part 3 - S5-E33
Continuity mistake: Just before Silent Swordsman transforms from a Level 6 monster to a Level 7 monster, it is shown holding a sword in its right hand. The right hand is shown covering the top half of the handle, but when it begins to change from Level 6 to Level 7, its hand is covering the bottom half of the handle. (00:15:50)