Awsome "beast" of a project you have going there. I have a critique- use it or not, as it is only a nit-pick. Still, I hope it helps...
I assume the Archer du Chaos has a ranged attack value of 2. Does the same attack value also apply to adjacent attacks, say with a Shortsword?
Another way to go at it is to use alternate weapons, as the Elven Archr does in the Elf Quest Pack. The Attack Dice are noted as
4(1).
Special text on the monster card details the attack values:
Elven Archers roll 4 combat dice
when attacking non-adjacent targets in
their line of sight. They roll only 1
combat die attacking adjacent targets.
Looking at the Archer du Chaos picture, I'd say the attack values are 2(1). Even if you went with 2(2) attack values, the detail text of non-adjacent and adjacent attacks is useful.
I'd suggest "Ranged Attack:" as introductory keywords.
Another approach is to imitate the detail text of the Crossbowman mercenary cards from Wizards of Morcar expansion set:
Cost: 75 gold coins
Special Ability: Wields a crossbow
Of course, you would need to delete "Cost: 75 gold coins" and substitute
shortbow for
crossbow.