This weirdly named AA ability, "Mass Affected", was introduced with CotF and it deserves mention. Each of the three levels boosts a warrior's maximum HP by 3,000. That's a total of 9,000 effective permanent addition to a 100 warrior's base HP, for a cost of 39 AA's. That's BIG! I don't even see it mentioned on the warriors site, steelwarrior.
Might even be better than 9k since I've only bought the first two levels (12 ea), not having enough unspent AA points for the 3rd (15). Will update this post if necessary after I buy it.