How would you build an aberrant bloodrager if you wanted to take the most advantage of staggering strike?
Clearly you need a weapon with a high crit range. But would a big twohanded weapon be better or TWF with two high crit weapons? Going the second way would score more crits but you'd me even more MAD and you'd need lots of feats.
For two-handed I guess the falchion would be good as it doesn't require EWP and has 18-20/x2
Before you can afford keen or fulfil the requirements for improved critical, is there anything you can do to get more crits?
More attacks might help. That could be done by getting a bite attack for example. But at a meagre 20 crit range.
How can you up the DC? Would staggering strike work with ability focus (I know that SOME people think this is a GM only feat)?
The only other option seems to be increasing Con.
Is there anything else I might be missing for low to mid levels?
I'd say it depends on hows many attaks you get in a full attack.
If I had 16, or even just 11 BaB and a 15-20 weapon, I wouldn't do TWF, as multiple crits are redundant.
Before this, two-weapon fighting starts to make more sense. But I'd be hesitant to make a crit-centric build when I haven't got access to improved critical or keen, and when you start getting keen on two weapons, or improved critical, you're aproaching 3 attacks per round fast.
wield a fauchard for reach plus 15+ crit range when keen or imp. critical'd
combine with whirlwind attack to possibly stagger ALL the things withing 30 or more feet.
Add lunge and enlarge person (on the aberrant spell list) to stagger foes 40' away (i think)
I guess armour spikes are necessary for anything closer than 20' tho (15 and 30' if you choose not to use your lunge)
With a decent amount of AoO from combat reflexes and challenge anyone to hit you