Firstly, my GM has given me a specially enchanted warhammer that deals +2d8 (3d8 total) weapon damage and is allowing its bonus damage to be multiplied when I vital strike. I'm going to be using Torag's Divine Fighting Technique on my ranger to make vital strike attacks on one AoO a round using this warhammer. I dont need/want to be dissuaded from going the vital strike route. I know its not the most damaging way to do things, but the 3d8 warhammer should help with that.
How can I actively ensure that in every round of combat i'll get an AoO? Are there any feats I can use to force an opponent into provoking, that almost nothing or nothing at all is immune to? (Not tripping focused because too many things are immune/resistant to that, for example.)
I want to move up, vital strike and then make an AoO as soon as possible, so preferably something that forces an enemy into provoking that I can combine with the attack action used to vital strike. Are there any feats people can recommend that will make this easy for me?