When players don't take certain weapons that have a small chance to cause Status on normal attacks (Charge attack status like Brandish is way too guaranteed) offense becomes dull and completely unaffected by RNG, and RNG is something that can make an MMO of any sort exhilarating.
I suggest Critical Strike Chance - All knights have a base 5% chance to cause 100% extra damage. As this is theoretically a 5% damage bonus to all weapons regardless of attack speed (smaller damage, faster speed, less benefit but it happens more, etc), all monster health should be increased by 5% so there is theoretically no nerf or buff of any sort - until RNG does its magic.
Then, Critical Strike Chance and Critical Strike Damage could become armor / weapon bonuses to further expand this MMO.
How to balance the stats? 1% critical strike chance with no attached bonuses besides a simple 100% damage bonus on critical strikes will be the same as a 1% damage bonus theoretically. Simply make it comparable to our current damage bonuses.
No. We don't need another thing to make blitz needle op.