Right, If You Have Any Spare Potions Use Sparingly As "Walter" Does A Huge Amount Of Damage

First Set up Your Gauntlets To Shock And Blades As These Will Be The Attack You Will Be Using

Keep Pressing B And Aim Towards Him, The Shock Will Stun Him For A Few Miliseconds Just Enough For The Blades To Hit

If WalterMoves His Sword, Keep Rolling Out The Way And Repeat The Process Until You Kill Him

It Will Take Time If Your Spells Aren't Top Level As Mine Wasn't But The Payoff Is Well Worth It

BTW..... It May Look Like That It's Too Good To Be True But Believe Me It Really Isn't Easy And It's Not Over There You Can Still Finish Your Quests Off And And Roam Around