Overview
In the early game, focus on farming by maximizing his stack so that you can keep Aulus enhanced basic attack. To keep his stack, you can use his skill 1 when you moving around. Not only his skill 1 would stack his basic attack, he also get CC immune. Tips on maximizing his CC immune: When you engage to the enemy, use your skill 1 and attack the enemy with your basic attack/skill 2 and use your ultimate when the CC immune bar are almost out. By doing that, you get longer CC immune effect. But remember, Aulus ultimate CC immune are only in his last swing, that's why immediately cast your ultimate.
Strengths
Aulus is strong on farming due to his enhanced basic attack. His enhanced basic attack are also have long area so u can hit the enemy behind the one you are hitting in front of you. Pair him with hero with CC so you can maximize his power
Weaknesses
He is weak in the early game, so just focus on farming and have your team to cover you up in the early farming stage. Don't try to engage the enemy when your basic attack stack are 0 because it would give the chance for your enemy to clapback or run away
Jungler
Ice Hunter's Swift Boots would give you faster basic attack. War Axe are his top priority item. Brute Force are good to reduce CC from your enemy. Rose Gold to give the advantage when your HP are low. The last two slot are for the item that u needed for certain scenario. If your enemy have shield and HP regen, you can use Sea Halberd. If your enemy have high defense, you can use Malefic Roar
Jungler
Emblem fighter would give you the advantage of staying for a long fight. Swift would give you faster basic attack. Seasoned Hunter is a must because you are jungler. War Cry can boost your damage because it would boost your damage when you use your combo. You can also choose Weakness Finder to slow down your enemy
Battle Spell
Use it to the creep to boost your farming. Use the blue one so you can slow down the enemy from running away from you
Early Game
Focus on farming. Kill the enemy when you had the chance, but don't do it alone. You damage are still low even with the basic attack. Don't forget to get the turtle with your teammates
Mid game
Keep farming, but this time roam to your team to so you can get kill to gain advantages for the late game. Don't forget to take the lord as well
Late game
At this point, you can play crazy. As long as you can maximize his enhanced basic attack and his CC immune, Aulus are pretty much a monster
Best With Atlas
Atlas passive that slows down the enemy are a great partner for Aulus because Aulus can have time do deal damage to the enemy
Watch Out For Marcel
Marcel constant CC and his ultimate would be a nightmare for Aulus that need to maintain his stack