I got idea.Main Char is a veteran from previus war that is in prison cuz of crimes he did to protect his ppl in that war.And new war has just began and city where he is in prison is under siege.
So he escapes,takes nearby guards weapon and starts slaying his way home where he finds his familiy dead and a miniboss who did it.So u kill him and u go to get your revenge.
Hope i helped u.If u need any other idea,feedback or help just post it here.
haha diablo is fun really but it doesnt take away from wc3 im living proof of that me my bro and my uncle used to LAN Diablo 2 all the time yet i still played wc3 as well so it was no biggy really but seriously im looking forward to this campaign i think it will be one of the best so far probably the longest too!