Job Trait: "Crippling Blow" - Occasionally doubles the damage of the next physical attack to strike an opponent. (5-10% rate, can process on a missed hit, can process on weapon skills, but only on the first hit.)
My idea with "Crippling Blow" was that it would process like a critical hit, like this:
First attack round:
Therin's attack deals a crippling blow!
The Forest Hare takes 200 points of damage.
Then, since the monster is "crippled", the very next attack from the same player would deal double damage. This would be a little more interesting that just straight up doubling the damage occasionally and would force more user input. For example, if you waited to weapon skill until after you saw the message, your WS would force double damage.
This would be a low activation rate, 5 or 10%, so it wouldn't be overly powerful I think.
I'd be happy with a straight up double damage trait too, of course, but I like the idea of making jobs more complex and engaging.
If you wanted to make DRK more party friendly you could even open it up to allow "Crippling Blow" to apply to other jobs. So, the DRK processes a "Crippling Blow" attack and then a SAM uses Tachi: Gekko immediately after, and his Gekko does double damage. This would make DRK more interesting and allow it to do more damage, both directly and indirectly (by allowing another player to deal more damage thanks to the DRK with "Crippling Blow").
If they implemented this idea, we'd be seeing inevitable DRK gear with bonuses like "Crippling Blow"+5%, increasing its chance to activate.