Do you like playing Aatrox? Sometimes when you can't get top role to play Aatrox in draft, how about consider playing him as Support? I've got a solution for this!

(Updating)

We will be only using Glacial Augment as the main rune, with cash back to compensate the low income from Support Role, and Biscuit Delivery to sustain in early lanes.
And MOST IMPORTANTLY, we are utilizing Jack of all Trades(JoAT) to gain extra haste and AD when building items.

Why JoAT? Because the support item already gives you 3 stacks, building into 10 unique stats is therefore not difficult.
At 5 stacks it provide 10AD and 5 Haste (Worth 350G of Stats!) ,and at 10 stacks it gives 25AD + 10 Haste.(Worth over 1000G of stats!)
It will help a lot to catch up in the Support Role.

And why Glacial Augment? Well, it provides more pressure in lane and fights when you hit Q, and it also reduces the damage from enemies (to Your ADC) when fight happens in lane.
The slow also allows you to hit your Q more easily and the slowness scales with your Bonus AD/HP.

Last Stand- if you played Aatrox you know his health bar is always like riding a rollercoaster, bring Last Stand to let you maximize damage while low health

Triumph- good synergy with Ult, helps to reset.

As I have said, we are bulding items to maximize JoAT as quickly as possible.

The World Atlas (support item)already grants 3 different stats to the JoAT (+base health/mana regen, and +health)

ONLY upgrade into Celestial Opposition. It helps you to survive burst damage. You are leveling up and buying slower as you are in Support Role, which means you will have lower stats than that of when you are playing Top.

FIRST BASE:

You would want at least 550G minimum to buy Glowing Mote + Boots, which will help you to Reach 5th stack on JoAT. But if you have more Gold, you can also replace any of the choice with Long Sword or Null-Magic Mantle.

FIRST HALF ITEM:

Caulfield's Warhammer (or Mercury's Treads)
Both costs 1100G and gets you over the first 5 different stats needed, hence you will receive +10 AD from JoAT.
You will eventually needed to buy both items for the build but you can choose which to buy first depending on the situation.

- Mercury's Treads gives 3 stats (+Tenacity, +Move Speed, +Magic Resist). Buy it FIRST if you feel too much pressure from opponent mage support (like Lux).

- Caulfield's Warhammer gives 2 stats (+Attack Damage, +Ability Haste). If you want more output, just go for it. The hammer can be build into Eclipse or Sundered Sky.

FIRST ITEM:

Eclipse (or Sundered Sky)

- Eclipse is Cheap (2800G), Op passive and gives 70AD.

- Sundered Sky is 300G more expensive, but it works well with Aatrox passives.

SECOND ITEM:

From buying the Items stated (Eclipse, Merc Boots& World Atlas), we already has 8 Unique stats gained from items.
Buying either of these can help you to reach 10 stacks. Choose the item depending on the situation.

- Opportunity: (give Lethality & %Move Speed) Buy when enemy has low armor. The burst move speed from passive by assist/killing champions also matches well with Ult.

- Lord Dominik's Regards: (gives Crit & % Armor Pen) Buy when Enemy has a lot of armor. (40% penetration from LDR is crazy on Aatrox and > Serylda's Grudge)

- Mortal Reminder: Buy when enemy has a lot of Healing.

Then just buy any item suitable.

While in lane, you won't have to worry about cs anymore so just focus on landing abilities, poke with QE, and ESPECIALLY YOUR W ( Infernal Chains ). W give a lot of pressure because:

-If he (ADC) is pulled back, it gives a lot of window for you and your ADC to poke.
-If he tries to escape, he might lose some CS while running.

So cast your W wisely.

When to use ULT ( World Ender)in early game?

ONLY PRESS R when you are sure you can make a kill happen (or get flash), and in team fights. (Or to save your life and run away.)

Next, we are going to talk about things you should do after laneing phase.

Aatrox has high mobility thanks to his E,

( Umbral Dash) he can easily move across walls. So take advantage of this and get more vision on the map by placing wards. You would also want to follow the Jungler to search for kills. By assisting your team to take control of the map, you can get more gold from farming objectives and kills, which will help you to buy items quicker and get you the strength to solo carry the game.

Farm until you feel like you can solo carry the game, then just play like Top Aatrox.

Hope you will have fun!