Cast Pursers as soon as you invade or are invaded...switch over to Moonlight sword 2 handed and ready the magic attack that will eat through thier shield and armor after the pursers remove the poise and endurace from the foe. If you need a back up switch to the silver knight +5 sword and use crystal magic weapon. This build lets you move around fast so you dont need to worry about getting hit..hence the low Vit. The R2 attack and Dark magic should be enough to keep the backstabers away