Alter Aeon FAQ (Frequently Asked Questions)

FAQ 5.6 - How does AC and armor work?

AC and armor protect you from blows by reducing damage when you are hit.
A higher armor score is better, for example 200 armor is better than
0 or 100.  Negative armor is very bad, and makes you more vulnerable
to damage.

For ARMOR equipment, you want the Ac-Apply to be high.  9 Ac-Apply is
better than 5 Ac-Apply, sometimes a lot better depending on where the
item is worn.

On magical items, a positive ARMOR Affect is also good:
Affects: ARMOR by 8 is better than Affects: ARMOR by 3.  Note that it
is possible to have negative armor, which will actually make you more
vulnerable to attacks if you wear it. Avoid items with negative ARMOR
effects.