Pro:
- Incredible kiting potential.
- Fun to play.
- Strong hidden ability (Rage in opponents when you run away with 3 HPs).
- Best wave clear in the game.
- Best champion for proxy.
- Strong team-fight.

Cons:
- Very hard to master.
- Strange/not easy laning-phase.
- You need to learn macro-game to use him well.
- Ultimate dependent

Ok, let's look at the abilities one by one and how to be a great runner.

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When Singed passes within 225 range of a champion, he drifts off of them, gaining 20% bonus movement speed for 2 seconds. This effect has a champion-unique 10 second cooldown. Little burst of movement speed, this can help you for deal damage with Poison Trail an go out from trade... And to be a grat runner.

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Toggle: Singed leaves a poison cloud behind him for 3.25 seconds. Enemies standing in the cloud's trail are poisoned for 2 seconds, taking 5 / 7.5 / 10 / 12.5 / 15 (+10% of ability power) magic damage every 0.25 seconds for the duration (continually refreshes while remaining in the affected area), for a total of 40 / 60 / 80 / 100 / 120 (+80% of ability power) magic damage over 2 seconds. "The killing fart" ... Run to the map and kill people with the smell of your fart! The more he is smelled, the more he does damage. Thanks to Rylai's Crystal Scepter your farters slows those who sniff, this allows you to escape and continue to inflict damage with your exhalations.

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Singed covers the target area with a potent adhesive for 3 seconds, slowing by 40% and grounding all enemies within. Are they chasing you? Are you chasing someone? This liquid of dubious origin, helps you in these cases, and remember that the champions inside Mega Adhesive can not use dash. If you Fling someone over them, snare them for a few seconds.

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Singed flings an enemy over his shoulder (500 units), dealing 50 / 65 / 80 / 95 / 110 (+75% of ability power) (+ 4 / 5 / 6 / 7 / 8% of target's maximum health) as magic damage. If the flung enemy lands into Mega Adhesive Zone, they will be snared for 1 / 1.25 / 1.5 / 1.75 / 2 seconds. Do you see someone trying to escape from your exhalations? Take it and throw it behind you, where your stench remains! In addition to inflicting decent damage, this ability is very useful in team fight, you can launch an enemy in the middle of your team condemning him to death. If launched on Mega Adhesive, the unlucky, is stuck in place.

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Singed drinks a potent brew of chemicals, granting him 30 / 55 / 80 ability power, armor, magic resistance, movement speed, health regeneration per 5, and mana regeneration per 5 for 25 seconds. This drink is indispensable for Singed, these huge buffs to all statistics, allow you to run among the enemies damaging them with Poison Trail, Fling priority targets in the middle of your team and stay alive to fight back.

Now let's talk about the primary runes. Sorcery for me is the best choice for Singed.

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I like this little "mouse" that flies from enemies and beats them every time they are touched by Poison Trail. Aery can also activate 2 or 3 times in a row thanks to our continued damage. All this makes it better than Arcane Comet.

Read Summon Aery

No way to proc easly... so more damage from Summon Aery

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Mini Hexdrinker at a 60s cooldown is a great choice against a strong APC ( Viktor, Karthus as for the 8.24 Patch).

Singed is very mana hungry, this rune can help you for the early-game.

We are a runner... Take it without thinking!

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Read Celerity

This rune, even after the nerf, is a must on Singed, remember, speed is one of the strongest weapons of this beautiful champion. RUN TO WIN SINGED !!!

Read Celerity

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Damage continued to add to our Poison Trail, why not?

Generally i dont take this, it's too situational for Singed.

Mmmm no... Too slow for me.

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Now let's see the secondary runes.

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Inspiration it's great in some cases, mainly when you need to buy items as fast as possible.

Being able to buy items earlier than normal can make the difference between winning or losing Lane, especially in hards match-ups.

Other speed? ... Yes, thank you, I'll take two of these.

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Take Resolve against hard match-up, or everytime you need more defense.

Is a must against a poking-lane, Second Wind + Doran's Shield, heals you a lot every time you get damaged by enemys. Giving you the chance to stay in Lane longer and eventually win trade against the enemy.

One of the best runes of Resolve. Mitigate damage during the laning-phase, it gives you advantage over your opponent in early trades.

Free Hp's? Why not? Seriously ... do you need an explanation?

It might be useful, but I prefer the Overgrowth HP's bonus. I teke this only vs enemys with a tons of CCs.

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Domination, i take this in easy match-ups where i can snowball, this runes can help to deals more damage expecially in laning-phase.

With Rylai's Crystal Scepter or Mega Adhesive, this runes can deal decent amount of damage, useful to be more aggressive.

Singed is ultimate dependent, so take it if you chose Domination for secondary runes.

Now let's look at the core items of my favourite build. Obviusly this list can changed in base at the situation, expecially the "first-back", when you're behind or it's a difficult lane, the first item will be difensive like Spectre's Cowl or Bramble Vest.

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One of the best 1st back, this potion, in addition to healing and making you mana, increases the damage of AA and single-target skills, allowing you to win small trades during the laning-phase.

The best 1st back if you are against a heavy AD with sustain like Tryndamere or Aatrox, inflict Grievous Wounds reduces all healing received by 40%.

Rush this item against a champions that relies heavily on AAs like Vayne, Quinn etc etc ... It will allow you to resist the poke and stay longer in the lane.

Rush this item against a champions with heavy CCs and magical damage.

Tons of AP, HPs and one very useful passive, for Singed, slow down the enemies that remain in the Poison Trail, makes this item a core. Very useful in all phases of the game.

One of my favourite defensive item, armor HPs and one very useful passive. On Singed this plate is essential.

HPs, mana, MR, CDR etc etc... All useful stat, but the most interesting thing about this item is the ability to make mana suffering damage, healing yourself when dealing damage with your ability and making enemies less resistant to magical damage. Abyssal Mask is a must especially if you have other champion AP in your team.

Absolutely core item in every Singed build, with Rylai's Crystal Scepter or Mega Adhesive, can deal a tons of damage. HPs and AP, they are always comfortable.

Good statistics at a good price, and the speed of movement is one of Singed's best weapons. Core item if you do not prefer Turbo Chemtank.

Glacial build. These two items are the basis of this build, slowing down enemies and increasing your speed, gives you a huge advantage in fight, but offer less HPs and defenses compared to the classic build items.

Other good statistics at a good price and 2 cute little ghosts running around slowing down enemies and activating Glacial Augment ... Funny!

This ... thing ... (I never understood what it is), spray icicles in a cone in front of you slowing down and damaging all the enemies that hit, and ... yes, they activate Glacial Augment.

Laning-Phase

Singed laning-phase is one of the most difficult and weird of the game.
Poor Singed currently has a lot of couters, so in order to play it correctly, you'll have to learn both the champion and the macro game to perfection. Singed is very strong in the proxy, but if you do not know where the enemy jungler is, or you do it in the wrong stages of the game, you will only end up giving the opposing team the advantage.
I usually tend to do "Singed proxy", only after lv6 and after buying Control Ward at will, this is because Insanity Potion gives you very high defenses and a good speed to help you escape from the inevitable gank by the enemy jungler, the wards, can give you the map-control you need to proxy.
In the initial trade of the game, you can take advantage of Noxious Slipstream + Poison Trail to inflict some damage and return to safety.
In some match-ups, as a first spell, it's great to take Fling, during trades where you have the minion advantage, throw your enemy in the middle of your wawe and continue to attack him, every minion inflict about 10 damage to the second, so in the early stages of the game they can kill or otherwise win you a trade.

What is the proxy? The proxy is to farm between the first and second opposing tower, or between the second and third sometimes, and let your minions push the opposing tower, putting in difficulty your opponent who will always have the minions in the tower and not will be able to push or roam.

Now let's watch the warding for proxy.

Team fight

In team fight, Singed, if used well, can be a cancer for the opposing team. Area slowing and life percent damage with Rylai's Crystal Scepter + Liandry's Torment, tankiness donated by defensive items and Insanity Potion, the ability to Fling targets priority, all this running away thanks to the speed buffs, hunt fugitive enemies with Mega Adhesive etc etc ..
If you have a team that can hold a fight in 4v5 ... SPLIT-PUSH IS THE WAY! To stop a Singed in the advanced stages of the game, in most cases they have to go in 2 or 3 people, and they do not always succeed.

Ok, we have reached the end of this short guide, I hope it will help you to discover this fun champion and maybe climb in ranked. I will try to keep my guide always updated. Thanks to everyone and see you soon!