If you wanna play with this build in other lanes, feel free to do it. Just ignore all the support items part. I main support so this that's why I talk about support items.

None
I only main this champion because I can only support and he's good

Its good if you can actually get some stacks of dark harvest. If you can't well then don't use this build. The early game of this build isn't that good but the late game is good. For electrocute, you're really good early game but then you start to become ****tier and ****tier, just like your personality when you start to play Yasuo. The good thing about this build is even though you inted early game, you still can do good late game as long as you get stacks for your dark harvest.

I prefer Ancient Coin over Relic Shield only because of the movement speed. If you want to help your adc sustain a bit more, still get Ancient Coin because this is my build and this build is more self centered just like you.

I rush the Nomad's Medallion for the gold. With the Ancient Coin, the gold that are dropped give you 25 gold but with the Nomad's Medallion, you get 45 gold instead of 25.

I take Mobility Boots because late game, you're gonna be zooming with your Relentless Hunter if you didn't fail to get all your stacks, Mobility Boots, Youmuu's Ghostblade and its active, and your Ghostwater Dive. You go insanely fast and you can help defend your towers and get to enemies fast.

I get Duskblade of Draktharr because its recommended and without it, I int. it just might be because I'm really bad.

I still don't know what to get next. Youmuu's Ghostblade or Black Cleaver. I think Youmuu's Ghostblade is better to get first but I usually get Black Cleaver first.

The last 2 items I get are Death's Dance and Blade of the Ruined King. I recommend Death's Dance first because its an actual recommended item. I get Blade of the Ruined King last because of the extra attack speed, life steal and damage. But for me to get the Blade of the Ruined King, I sell my Nomad's Medallion and buy back Stealth Ward.

There are 2 parts to your passive Gift of the Drowned Ones. The first one is the grey health one. If you are hidden, then you will regenerate your grey health back. If your in a bush and your not healing, guess what, there's a ward. Bind a key to show where is warded then your gonna be useful for once.

The second part is you turn 14 of your extra health from things like runes and items into 1 AD. This means the only way for you to be tanky is to build armor which we don't need because my superior build don't need none of that armor.

Early Game

no electrocute = ****ty level 2 all in
I know it sucks but if u can get more stacks, the better your late game is.
If your adc is useless, well that sucks.
When adc is dead or backed, take farm. u need the $$$.
Your not as good early game with electrocute but it doesn't matter, all you need is the dark harvest and $$$.
Don't upgrade to the Remnant of the Ascended. It give you 14 AD, another ward, and an extra 75% base health regen for the price of 650 gold. I mean if you really want the extra ward, go for it. You'll be selling this item for your full build anyways.
Don't build tank items because all you want is full AD.

When you get your ult

Now you can get more stacks easier (np, I know you would never knew without me telling you)
When you killed both support and adc, ult the minions, who gives a single **** about your adc (ok, still take care of them. Their the one that's getting your enemies low)
Don't try to be nice and spoon fed your adc. Your ult gives them money so who cares if they don't get a single kill. They still got the $$$
You can use your ult to cover distance between you and a enemy champion. I would only do that if you already used your ult. The only times where you will jump to where your ult is when you use it is when you hit a enemy champion. Do not use your ult over a wall hoping you're gonna be able to run away.

When your fed (which is very unlikely because its you)

Now you should be able to deal damage on your own. That doesn't mean you go 1v5. You can just w up to an adc and kill them.

If you feed (congrats!)

Stay in team fights and ult for the kill. This gives you $$$ and more dark harvest.

Team fights

cc kills you easily in team fights coz you squishy. Don't dash in and int. Just hook enemies and then harass the one enemy. Don't dash in to the enemy to try and stun the guy that you just hooked. You still can try and stun him but just don't int.
Your mostly going to be doing nothing and then ulting to steal the kill and then try and dash away if you didn't get cced. There's not much you in team fights.

Running away by yourself

use Phantom Undertow first before you use your Ghostwater Dive unless your in the jungle. When your use the Phantom Undertow right after you use the Ghostwater Dive, the Ghostwater Dive will be canceled.
You can use the Phantom Undertow to dash over walls.
If enemy is close, you can use your Bone Skewer without holding and then you will slow the enemy down.
If your backed up to a wall, you can use your Bone Skewer hook form to hook the enemy over the wall. This can work because your hooks distance is fixed so it will always hook in the same distance no matter how far away the enemy is. This is very situational so you won't be using this that much.
If you're gonna use your Flash and your Ghostwater Dive is up, use Ghostwater Dive before you Flash because your gonna be invisible.
If your not able to run away with all this, you deserve it.

Running with someone else (which is unlikely because your a loner)

You can use your Bone Skewer without holding it to stab and slow your enemy down if you're close enough. Don't hook unless your going to turn it around.
If your not low but your adc or whoever is low, you can wait a bit so the enemy is close to you then you use your Phantom Undertow towards the direction you running away to. If they don't avoid it, they will be stunned and your adc will probably be stupid and try and turn it around your all your work is useless because your adc inted for the 10th time.