I started playing Orianna Bot because Orianna is one of my favorite champions, but I dont usually play mid. This is somewhat of my experience playing her in Bot lane.

This build is meant to adapt Orianna to the playstyle of bot lane, and not some obscure build that i think outperforms the other ones.

Orianna in bot lane would play signifacally different than in mid lane for a couple of reasons:

-Enfasis on farming rather than roaming. There is not a strong need for fast wave clearing, instead playing often for the slow push.

-2v2 trades. Having a support that can CC your opponents makes constant damage more valuable than burst damage.

-Less Exp, but usually more gold. This again puts more emphasis in your items damage.

Pros: Great burst damage. Strong level 6. Strong mid-game. Teamfight oriented ultimate. Some utility in her kit. Another AP botlane option.

Cons: Lack of mobility. May lack in constant damage. Not an Hypercarry. Requires mastery on the champion. Relies too much on her Ultimate. Easily ganked. Unpopular pick.

Flash works well out of habit. A summoner easy to miss if you dont take.

Heal is good against poke matchups. Not only for the sustain aspect of it, but also to for the aggressive movement speed burst when picking on an enemy.

Barrier is for heavy burst matchups or for an assassin mid/jungler who will want to roam bot.

Cleanse for matchups that rely on one strong CC to win trades, i.e. Morgana, Ashe, Varus.

For the Nashor's Tooth build, the precision tree makes the most sense.
[Press the attack] has the most synergy due to Oriannas burst inclined damage, enabling some combos regarding the 3 attack proc. Lethal Tempo may work in specific scenarios where you can permanently autoattack without threat, but that will mostly not be the case.
Triumph, because you want to take very aggressive all-ins in the early game, specially if you have a melee support.
Legend: Alacrity for extra attack speed. Legend: Bloodline procs on Nashor's Tooth on hit, but not on Orianna's Clockwork Windup.
Cut Down because you want to take the longer fights, usually when both you and the enemy are full health.

As secondary rune i like Sorcery, mainly for Manaflow Band, because Orianna is very mana dependant and i dont build any mana item. Otherwise i would go for the Inspiration tree.

Gathering Storm because as bot laner you have no means to close a game fast.

Nashor's Tooth gives Orianna the ability to play for uptime. The on hit damage from it, plus the on-hit damage from Oriannas passive almost make the same damage as an AD build would. This works better when paired with Engage supports, since you're ready whenever they engage, and you have constant damage for prolonged fights.

On the first back I recommend aiming to buy Blasting Wand, or Amplifying Tome if you cant afford it. After Blasting Wand go for Recurve Bow only if you afford to buy it whole, otherwise again start building fiendish code.

For your second you could argue between Shadowflame and Rabadon's Deathcap. Shadowflame -very- slightly overperforms Rabadon's at 2 items, and its cheaper. Rabadon's clearly overperforms Shadowflame at +3 items. In my opinion i always aim for Shadowflame because i like playing for mid-game.

On your third item Void Staff will be your default, considering the enemy team drafted a proper team and have at least 1 tank. If they have no tanks you can buy Rabadon's Deathcap. If the enemy team have assassins, and specially if your team has no peel for you, you may want to give up your third damage item for a defensive one like Zhonya's Hourglass or Banshee's Veil.

The fourth item is a tricky one, from this point on in the game a lot of rensponsability will fall on you as the adc/apc, you're now the main source of damage and if you fail to do so your teamm will lose all teamfights. While you can just default to buy Rabadon's Deathcap or Void Staff if you haven't, i really wouldn't recomend buying more damage. Phantom Dancer works really well against melees and tanks (even assassins), not for the attack speed, but for the 8% attack speed that will help you outmanuver them, despite wasting money on crit chance that you wont use. (Locket of the iron solari) is very good against ranged oriented teams, specially those that rely on cheap constant damage champions like Zyra, Brand or Teemo.

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14.24
-Synergies and Threats updated
-Guide redacted