Equipping axes, or any
weapon, is pretty cut and dry. You need to spend an extra ability
point for each rarity of axe. A common (level 1-white) axe costs 1
AP, whereas, a heroic (level 4-purple) costs 4 AP. You'll notice
when you get to level 3, rare (blue) axes, that "+25 AF if using
basic attack" gets added to the description. This is a passive
ability that triggers automatically when you use your basic attack.
Many action abilities are dependant on your basic attack so the AF bonus
will apply. The abilities that say "In addition to basic
attack..." are obviously the ones which fall into this category.
Abilities like Leech Life
and Aura don't count bonus AF
into the equation, just your basic core stats.
For a little extra AF boost,
multiple weapons can be equipped and the bonuses do indeed stack.
It you were to equip your
Dead-Hunter with Axes 3 AND
Dual Wielding 3, he
would then get a +50 AF bonus each time he used basic attack,
Killing Blow, or
Disarm. Level 5 of weapon
abilities grant a +5 DAM to your basic attack. This bonus is also
stackable.
There are a handful of
units which get the ability
Weapon Mastery. This allows the unit to equip any weapon in
the game!