I think it's good the way it is now.

attacks

and rolls

defends with

may roll 1 die to counter attack with his pointy shield, and rolls

dies.
The thing is: the chance of rolling more

than needed is pretty low. After that, you only have a 50% chance of rolling a

for each die you may roll. So that's half of a low chance. I think that's mild enough for a bonus to the shield. And 500g is a good price for that. You might want to change the roll for the pointy shield counter attack from

to

or even

if you need slimmer odds, but I wouldn't let the enemy defend.
The mechanic is like this:

attacks in melee, close combat, but the

is cunning enough to employ his dangerously spiked shield, not only to ward off the attack, but thrust the shield into the attacker, causing a potential killing blow if

(or

or

) is rolled. You can't defend against a defense
