For DK i suggest some block-range change for their skills.
Decay: 5 blocks (down from 7)
Harmtouch: 3 blocks (down from 7)
Terror: 9 blocks (up from 7)
I think that a range nerf for decay would be beneficial because 7 blocks is a really far range for a non-caster spec attack, especially for something with no warmup and a very low stamina cost. The low stamina cost is relevant to the range because if a person is chasing someone they might try to get off a skill, but be force to endure the penalty of not being able to run, due to low stamina bars.
I believe that harmtouch needs a large range nerf, because it is currently not being used as a nuke and is instead being used as a fail-safe. Harmtouch is now almost exclusively being used if the person realizes towards the end of the fight that they are not going to win. This is expecially problematic because empathy does not use stamina, only mana, so both of these skills can be used back to back. This combo does not have a warmup, has a 7 block range, and does around 450 (i think, not sure what HT damage is precisely atm). I do not think that empathy needs a range nerf because it is how DK typically catch people. I know that this same situation could occur because of empathy's slowing effect, but i think that this would make it far less worse.
I think that terror should get a range buff because i rarely see people using it and it is in general a somewhat useless level 60 skill. I think that the combination of a warmup and a low block range make it extremely hard to get off before the person runs out of range. A range buff would help DKs use this skill.