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Hello! My name is Krilep, I've been playing Lucian for a pretty long time! 7 years to be exact, and I will show you all the Pros and Cons to playing Lucian ADC and make sure you get some good highlights.
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PROS

+ Very mobile
+ Consistant damage
+ Clears waves fast
+ Strong at every elo
+ Lane bully

Lucian is a very fun champion to play. He is strong early and very mobile. Lucian can make plays on his own, independent of his support. He can singlehandedly carry mid game skirmishes which dictate a major part of the game. Press the Attack is very easy to proc on Lucian which makes him synergize with many supports well and short trades favor him very well.

CONS

- Hard to master
- Short range
- High mana costs
- Squishy
- Weak to hard CC
- Falls off late game.

Lucian has a very tough time coming back into the game when he is behind. This makes playing him more difficult. He has short range so he has to use his mobility tools to get in range, which makes him vulnerable to hard lockdown spells. Lucian isn't a hyper carry and cant win the game alone. Lucian falls off late game as well, so ending games early is a must for him.

FLASH
Taking Flash on ADC's is pretty regular, you can also combo it with your Q and use it to reposition yourself with R.


EXHAUST
I usually take exhaust to reduce the enemy laners damage, so I have a better chance at clutching a situation with my support.

HEAL
Heal is a spell that not only heals but also gives movement speed. In some scenarios it is beneficial to use heal for the movement speed, not only the heal. Heal can also save you and your support from dying.

Lightslinger (Passive)

After casting an ability, Lucian's next basic attack, within 3.5 seconds fires an additional shot after 0.25 seconds, which deals 50 / 55 / 60% (based on level) AD physical damage, increased to 100% AD against minions.

The second shot applies on-hit and effects at 100% effectiveness and is affected by critical strike modifiers.

If Lucian's primary target is killed before the second shot can go off, he automatically shoots another enemy in range.

VIGILANCE: Whenever Lucian is healed, shielded or granted a buff by an ally, his next two basic attacks within 6 seconds are empowered to deal 14 (+ 10% AD) bonus magic damage on-hit. The empowered attacks can stack up to 4 times.
If Lucian's primary target is killed before the second shot can go off, he automatically shoots another enemy.
Your passive can trigger on-hit effects such as Conqueror or Sheen. Your ideal combo would be:
W > AA > E > AA > Q > AA

To effectively do smooth rotations and be able to kite enemies would be using dash first:
E > AA > W > AA > Q > AA
With around 20% CDR your dash should be on a relatively short cooldown. Lightslinger (Passive)

After casting an ability, Lucian's next basic attack, within 3.5 seconds fires an additional shot after 0.25 seconds, which deals 50 / 55 / 60% (based on level) AD physical damage, increased to 100% AD against minions.

The second shot applies on-hit and effects at 100% effectiveness and is affected by critical strike modifiers.

If Lucian's primary target is killed before the second shot can go off, he automatically shoots another enemy in range.

VIGILANCE: Whenever Lucian is healed, shielded or granted a buff by an ally, his next two basic attacks within 6 seconds are empowered to deal 14 (+ 10% AD) bonus magic damage on-hit. The empowered attacks can stack up to 4 times.
If Lucian's primary target is killed before the second shot can go off, he automatically shoots another enemy.
Your passive can trigger on-hit effects such as Conqueror or Sheen. Your ideal combo would be:
W > AA > E > AA > Q > AA

To effectively do smooth rotations and be able to kite enemies would be using dash first:
E > AA > W > AA > Q > AA
With around 20% CDR your dash should be on a relatively short cooldown.

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Piercing Light (Q)

COST: 50 / 60 / 70 / 80 / 90 MANA
TARGET RANGE: 500/900
COOLDOWN: 9 / 8 / 7 / 6 / 5 ACTIVE: After a 0.4 - 0.25 (based on level)-second delay, Lucian fires a laser in the direction of the target enemy, dealing physical damage to all enemies in a line.

PHYSICAL DAMAGE:
85 / 120 / 155 / 190 / 225 (+ 60 / 70 / 80 / 90 / 100% bonus AD)

This ability CAN be dodged by simply sidestepping, dashing or flashing away from it. Your main use of this skill is to poke enemies down by using it on minions to hit them through the wave; pushing the wave, killing minions and simultaneously poking is the most effective way to use this skill.

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Ardent Blaze (W)

COOLDOWN: 14 / 13 / 12 / 11 / 10
TARGET RANGE: 900
COST: 70 MANA ACTIVE: After a 0.25-second delay, Lucian fires a shot that explodes in a cross pattern upon hitting an enemy or reaching the end of its path, dealing magic damage.

MAGIC DAMAGE:
85 / 125 / 165 / 205 / 245 (+ 90% AP)

Enemies hit are marked for 6 seconds, granting sight of them for the same duration. Lucian gains bonus movement speed for 1 second if he or allied champions damage a marked target.

BONUS MOVEMENT SPEED:
60 / 65 / 70 / 75 / 80

Some people choose to start W on Lucian because of the poke and synergy it has with manaflow band. Personally I've never done this start because I think Q just works much better at pushing the wave in early and has a better all in at level 2. This ability allows Lucian to effectively use his ult because of the movement speed that this skill gives. I don't see any other use for this ability (damage wise) other than another skill to use your passive and give movement speed.

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Relentless Pursuit (E)

COST: 40 / 30 / 20 / 10 / 0 MANA
TARGET RANGE: 425
COOLDOWN: 22 / 20 / 18 / 16 / 14
PASSIVE: Relentless Pursuit's cooldown is reduced by 1 second for each Lightslinger shot landed, doubled to 2 seconds against enemy champions.

ACTIVE: Lucian dashes a short distance.

Relentless Pursuit resets Lucian's auto attack timer.

This skill is what makes Lucian, 'Lucian'. The fact that each time you use a skill it lowers this skill down by 2 seconds is huge. This makes Lucian a very mobile ADC by effectively using your skill rotations you can use it to dodge abilities and reposition in teamfights. This skill can however be canceled at the beginning of the dash which will leave it on a high cooldown so be quick and cautious when using it. You can do a long dash or short dash depending on the scenario, a short dash will allow you to auto attack faster than a longer dash would. This ability can go through many small walls.

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The Culling (R)

COST: 100 mana
TARGET RANGE: 1200
COOLDOWN: 110/100/90 ACTIVE: Lucian fires shots in the target direction for 3 seconds, dealing physical damage to the first enemy they collide with. DAMAGE AMPLIFICATION TO MINIONS : [400%] ⇒ 200%

While using The Culling, Lucian cannot use basic attacks, Piercing Light or Ardent Blaze, but is ghosted, can move freely, and can activate Relentless Pursuit. The Culling can only be interrupted by crowd control that prevents the ability to use basic attacks.
At 0% critical strike chance, The Culling can fire up to 22 shots.
The total damage at the base number of shots is 330 / 660 / 990 (+ 550% AD) (+ 330% AP) physical damage.
Against minions, this is increased to 660 / 1320 / 1980 (+ 1100% AD) (+ 660% AP).
At 100% critical strike chance, The Culling fires up to 25 additional shots, for a total of 47 shots.
The total damage at the maximum number of shots (at 100% critical strike chance) is 705 / 1410 / 2115 (+ 1175% AD) (+ 705% AP) physical damage.
Against minions, this is increased to 1410 / 2820 / 4230 (+ 2350% AD) (+ 1410% AP).


The Culling can be reactivated to end its effects prematurely.

PHYSICAL DAMAGE PER SHOT:
20 / 35 / 50 (+ 25% AD) (+ 10% AP)
SHOTS FIRED:
20 / 25 / 30

Unfortunately this season Lucian's ultimate was nerfed hard in which the minion damage is very VERY low. This ability is now a good way to initiate fights because once you get Black Cleaver, each bullet adds a stack of the cleaver's passive, leading to a lot of armor shred. This ability also activates Lucian's passive. Once you get CDR, this ultimate can be used at the beginning of fights to help you gap close by using your abilities rotations correctly and always having your dash handy.

(You can also use your ult in Tahm Kench's belly!)

Honestly the key to getting these rotations down without missclicking or using the wrong ability takes time and practice. I used to spend at least 10 minutes a day in practice tool warming up my rotations because they're not easy to master and weaving your auto attacks in to get your E cooldown lower takes practice.

Q Rotation
AA + Q + AA + E + AA + WW + AA + E + AA.
Used mostly during lane

W Rotation
W + AA + E + AA + Q + AA + E + AA.
This is the fastest possible way to kill someone because of the W not having a long cast time like Q, allowing your auto attacks to come out quicker for PTA.

E Rotation
E + AA + Q + AA + W + AA + E + AA + E + AA + Q + AA + E + AA.
You can use your Blade of the Ruined King’s Active before your E (Relentless Pursuit) since it has a longer range than your Auto Attack range.

W + R Combo
This lets you chase enemies that are very far away because your Ultimate (The Culling) is the longest ranged ability you have, so, with W applied, each bullet will give you increased movement speed to chase them down.

First Item

GALEFORCE

My first item on Lucian is usually Galeforce, It gives you the damage you need but also gives you extra mobility.
With Galeforce you basically have 2 dashes, your E and of course Galeforce's Dash.
On top of this it also gives you extra movement speed on your other Items so I definitely recommend getting Galeforce as your first Item.

KRAKEN SLAYER

If you want more damage then definitely go Kraken Slayer as it gives you the damage you need to shred through the enemy team, It's passive is also pretty useful since It gives your other items extra attack speed. Every third attack with Kraken Slayer deals additional true damage, but do keep in mind you wont be as mobile so do play smartly and don't just go in for no absolute reason.

IMMORTAL SHIELDBOW

I don't really go Immortal Shieldbow on Lucian anymore but it is good if you want more durability.

ECLIPSE

If you want to build lethality Lucian then you can go Eclipse, It also gives you extra armor penetration if the enemy team is tanky. I only really build lethality Lucian if I'm ahead otherwise I just go with my usual build with him.

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Situational Items

Lord Dominik's Regards

Build Dominik's if the enemy team has a lot of armor, It will allow you to shred through their tanks easier.

Maw of Malmortius

Build Malmortius if the enemy team has a lot of AP, reduces their burst so you don't get one shot by them. You get a shield that absorbs most of their damage for 5 seconds so It's pretty good If they have a lot of burst.

Mercurial Scrimitar

Build Mercurial if the enemy team has hard CC, It also gives you a speed boost after using it so use it wisely. It has MR too if you need it.

Mortal Reminder

Build Mortal if the enemy team has healing, other than the anti-heal It's good for the attack speed It gives you too

Death's Dance

I build Death's Dance If I'm ahead and If I don't have any offensive durability, the healing on this item is pretty good so I recommend picking it up If you see yourself getting killed quickly in offense whilst being ahead.

Guardian Angel

I usually build GA for the armor but also for the revive. This is usually my final item.

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Offensive Items

Bloodthirster

Only build this item If you're ahead, It gives you good lifesteal if you need the healing.

Black Cleaver

Reduces the enemys armor so it's easier to shred through them, I don't really build this item if I'm not ahead. If you're even or behind, go Lord Dominik's It's better than Black Cleaver In my opinion.

Navori Quickblades

I only go Quickblades for the damage and low cooldowns.

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