Champ that utilizes Duskblade of Draktharr best?
Kind of a niche item, it's weird if you're healthy in gold as an assassin which is the class it's intended for you don't really need any more damage to finish off a target, but at over 3.2k it's not exactly cheap either. I haven't been playin League much but I still keep up with the updates and shit, so far I've just tried it on Lee Sin and Zed.
Zed- Like I said above deathmark would of already finished the target off, it was basically overkill. Nearing the end of the game I was actually making a conscious decision that if duskblade was off CD and i was about to assassinate a target I'd just activate youmuu's and not use my ult if I didn't have to, cuz I had too much damage. And this wasn't a game where I was completely stomping either, I couldn't tell you my KDA but it was just an average game I wasn't super ahead.
Lee-I main Lee so I he was the first one I tried out the new item on. I almost feel like it was more satisfying using it on Lee than Zed. Typical build that I use on Lee consists of Warriors, Merc treads, Maw, then a variation of defense items. Nice thing about using the item on Lee rather than Zed was I could put it to full use every time it was off CD. A squishy? Yeah I built some damage but if they were smart they weren't complete glass cannons and had some defensive stats and the extra damage was definitely beneficial.
Beefier targets/tanks (not recommended to waste dusklbade proc on) was not at satisfying as using it on a squishy, but I still felt like it was helpful. W/ Lee, especially building him like I do with 2 damage items and the rest usually tank, sometimes on a 6th item I'll go a bonus armor pen if they have multiple tanks, you'd think that it wouldn't be a significant chunk of damage but even on the tanks it is.
Sorry I'm ramblin it's early I've been up all night, TLDR;
Why the fk do I feel Duskblade is more beneficial when you're playing a champ that isn't building straight damage? Sweet item I dig it, only played a few games with it on Lee and Zed so definitely gotta play around with it some more
Post your guys experiences usin Duskblade with different champs and what you thought about it

,
and 

who if fed are going to blow you up, but if they're just normally farmed
is the perfect finisher to their combo. The 5% movespeed is also nice, it helps you get in range to initiate. It pairs really well with
.
but haven't tried yet, basically you can poke with Q and when you decide you want to go in your aa will have that extra kick