Quote Originally Posted by Saph View Post
Was that the one which got turned into Vital Strike? I can't remember what it did.
It doubled Str bonus similar to VS it was a standard action, but if you took further feats in the chain it became useable in a full attack (unlike Vital Strike).
Backhand Swing was 2nd feat in chain: 1st attack has double str or 3x Str bonus if +11 BAB.
Devastating Blow: This one was a standard action, but -5 to hit. If hit, auto Crit (no confirm roll, but doesn't activate things that rely on Crits like Vorpal or flaming burst).

I can see how DB might be not best as some people hate crit happening often, but Backhand swing was nice.

So you only add 6 to 12 Damage (assuming +6 str) to your attacks, but it has no hit penalty like power Attack so it was decent.

Vital Strike is always a standard action (no full attack). Since VS didn't multiple Str bonus, the don't interact (having both in the game wouldn't be Overpowered).