Undead, preserved correctly would not have a smell. Living things have a smell because of biological process in their bodies. When deceased these things stop. The only thing undead can “smell” of is decay, which happens if they were improperly raised or do not tend to themselves.
Since DK’s are practically “perfected” examples of Necromancy they probably don’t smell of anything anyway. The absence of scent is probably more jarring for animals and keener sensed beings than anything else
This is what I’ve always gone with for Ashi - ‘smells like absolutely nothing’ - and now it turns out that’s actually the most sound option.
Nice.
You’ll still smell of something, surely? Not rot and what have you, but ambient odours would likely settle on you, if only to a minor degree?
Well yeah, but to a degree it’d be negligible.
‘You smell like your surroundings’ is sort of obvious.
I smell like Dirt!
Pats you
That’s good.
Smelling of nothing is difficult to comprehend is the issue for me. Everything smells and tastes of something.
It being pretty unnatural suits them perfectly when you think about it. A being moving around without biological processes is in itself pretty unnatural.
You know that odd, sharp smell when it’s cold out? I imagine it’s something like that. Nothing but the cold.
If I recall correctly, the headless horseman was beheaded when he was alive and later risen as this accursed knight by Balnazzar. (He was beheaded before being turned into an undead not after)
Technically speaking he’s not an average death knight. Frankly if you’re beheaded, even as a DK, I’m going to say it’s likely you should, by all means, be dead.
The examples we have seen quoted (with few exceptions, such as the zombie) aren’t the rule.
For each example in favor of undeads being undying, we as many against it. So I’d say that perhaps lore just doesn’t give us any proper rule here.
Let’s see you trick your way out of this one
[Pulls out a Gun and shoots the warrior in the forehead]
Paladins can’t use guns.
I’m not a paladin in real life
Warriors (with a big W) don’t exist in real life either.
I’m not sure if this was true or not, but was he close to discovering Balnazzar’s identity? I’m not sure if I read that somewhere, so I could be wrong.
You say this but you’re posting as a DK holding a sword brimming with the Light…
That brings everything full circle to my point
That real life =/= WoW and WoW physics are different to allow the rule of cool
That’s how I RP combat, anyway! 
I set down an apple on the ground. This makes Bearan get instagibbed.
It’s not very realistic, but physics are different in WoW. 
(In case you were serious, all fantasy is based on real physics. Where it diverges, it is noted by simply being shown, such as with magic. For most cases you will still apply real world physics, for example an apple will fall from a tree the same way in WoW and IRL unless interfered with.)
drops his n.u.k.u.l.a.r. bomb lobbing totem
Alright then lets get physical.
Oh, not that I recall. Granted I read the story in wotlk, but the headless horseman was a valorous warrior who believed in the cause of the scarlet crusade.
At the time the scarlet crusaders often killed human citizen at random as they believed they carried the plague of undeath.
He begun to have some doubts about the scarlet’s cause. As the crusaders moved from village to village to kill humans, the horseman would kill his own wife (accidentally) and become mad: he would see undeads everywhere, even in his comrades. He still suffers from this madness in the WoW version of his character where he thinks he is still fighting the dead, when he’s in fact attacking the town of the living.
As he turned upon his own, he was beheaded. The body was brought to the scarlet leader, Balnazzar, who raised him into his puppet.