Dark Knight needs a refreshment like some other jobs.
But here`s my idea of what DRK really lacks atm;
Great Sword A+ skill
Dark Magic A+ skill
or at least the possibility to change Scythe A+ into A- to put it in Great Sword instead. Rune Fencer is a tank & has better skill in Great Sword than Dark knight Damage Dealer who is the best damage dealer in game for Great Sword, it makes no sense.
Finally, it lacks only a few dark magic to put it back in the game!
Death
Stun II
Darkness nukes!!
Paladin is a tank & can Holy & Holy II while Drk has no AM nukes for darkness...
At least add it some darkness tier 1 to 4 with an AM? like Paladin banish & holy, Dark Knight could cast Ruin I Ruin II Ruin III Ruin IV & Death as AM?
Dark Knight always was the Great Sword & Dark Magic expert, why don't it have A+ skills in those to reflect it?