I had to decide which augment to choose after the "Visions - Past or Future" task, and a friend told me to take the Disrupted Stone of Chaos, because "AC>all".
I recall from pen & paper RPG that the higher AC, the harder for the mob to hit you; and I know that in EQ it's a lot easier to come by stats, saves and hp/mana (by AAs, spells, gear) than AC.
But is there something else I'm missing? How exactly are the EQ game mechanics working concerning AC? Is there a roll against AC at the start of each mob swing?
In some ways, I'm still an EQ noob... ;-)