With Claymore Grip, Zahak's Mail, and full crit merits this great sword is crazy in Campaign, not to mention it is the highest damage gs for its level.
The 20% cap for crit hit doesn't count the +% from merits or gear so it would be 15% + X% from merits + whatever you get from your DEX vs the mobs AGI. The minimum crit hit from DEX vs AGI is 5% so with full merits and this weapon you'd have 24%+ crit hit rate.
A real campain "relic weapon"!
Best ever for campain.
-Increases critical hit damage:
Crical hits do 2.5 times normal damage!
Cruadin + Zahak's mail + Calymore Grip + Merit = 25% critical hits rate.
+ DEX vs AGI (Minimum 5% max 20%)
Total of critical hits rate 30% minimum to 45% Maximum!
(Look like to be capped vs Forteress [Since Forteress i think dont have AGI], then depend of your DEX vs Mob AGI).
A great campaign weapon, I would definitely recommend it to dark knights leveling in this area, unless you hate getting massive amounts of hate in campaign.
Criting 1 out of every 4 or 5 of your hits for around twice the normal damage of a critical hits is a great way to boost your exp gain.