Just a tip, before ML you have absolutely no reason to prioritize Battle Tactics, leave it for the last 2 levels.
That's because your crit rate is like 0.50% at that point. Starts to get better with ML gear.
Aura Heal is a bit useless in my oppinion, could go for a 5/5 Aura Strike instead, and Shield Fortress and Aura Armor aren't any wonders either.
But again, as you asked, that would be for a pre-ML scenario. Post ML you probably would like that Aura Heal for farming purposes if you don't have a Willow or you could simply buy pots, they aren't that expensive on AH and heal for a freaking lot (the Dayr ones). I used Aura Heal long ago to farm my Osiris stuff but after I got a Willow Worker I reset it. Turns out Aura Heal is just cheap, it doesn't work as described in both ways: firstly, at 6/6, it should heal for 100% your Attack Power per aura (max 3 auras = 300% Heal), but it heals for 33,3% for each aura (3 auras = 100%). Secondly, it should heal nearby party members, but it doesn't.
Anyway, it all depends if you want to keep your pre-ML build for ML purposes too, or if you want to reset it later.
You'll also find a 6/6 Grand Cross useful for grinding.
Hope it was helpful.
Edited by xLuc, 19 November 2014 - 07:14 PM.