As mentioned above, the dragon knight has minimum damage(Maple Story Meso) over time in a single goal, but because the train generally include combat Super body for the boss sent, they will always be a contribution in both sides. Additional, because the most powerful attack, the death knight can use knockback without sacrificing HP is a strength attack unbuffed.
They KB rate are much lower than the other classes of Maplestory, which makes them often in the fast changing the enemy caused more damage. Combined with the defender, this makes it very difficult to DKs solo, but it can be done. DKs level(Maplestory powerleveling), 100 + and hemoglobin, eventually will spend NLC cans of tank if the money than Sader and work if they the same number of contact points of damage.