X marks the spot!!!

[HestonFan23]

I have been looking over the army lists from book 2 and 3.  There are a few lists that allow you to field what I consider the uncommon "X" units.  They can be Psiloi or blades, etc. 

What effect do these units have in combat?  I have not been able to find anything in the rules saying what they do.

[Duncan Head]

There is no single section that tells you what (X) troops do. It is usually in the troop definitions and the combat results. For example, Bd(X):

Definitions:
Exception (X):   Men with weapons unusually dangerous to heavily armoured knights, such as ... . Treated as Blades (F), but destroy Knights scoring less.

Combat outcome:
If an element’s total is less than that of its opponent, but more than half:
Knights.   Destroyed by Elephants, Expendables or Blades (X).

So a Kn element losing to (but not doubled by) any other sort of Blade will usually just recoil, but if it loses to a Bd (X), even if the scores differ only one, it's dead. Otherwise a Bd(X) fights as any other Bd - but look at the rear support factors for another exception.

[HestonFan23]

Okay.  I will have to pay more attention to the combat results.  There is so much to learn and remember.  It does help to know that my armies do not have any X troops.