Hey guys Lcie here giving you guys a new way to complete your ultimate focus to ensure a victory, this guide is for Swain adc which doesn't sound good until you actually think about his abilities, you have his Q which slows the target for up to 40% at max level also a DOT damage great for catching up to your targets. Next is his W which snares the target that stands with in its AoE what better way than to slow and snare a target to just have the enemy adc take continuous damage from you and your cc and to top it off you have your bread and better to this build and what makes it most valuable the E which increases damage done to the target (by swain only) up to 20%. Lastly his R its really not necessary to have but adds that extra survive ability in extreme circumstances you get healed for a portion of the damage the ravens do.

The runes i use are for flat AD on all except for the seals which are scaling AD to help boost you up as you level to stay on top of things.
As for the masteries I go for 21/7/2 now that can be modified to your liking such as if you take ignite rather than barrier and want the masteries for the summoner spells.

For the items I go for a crit/Attack speed build on Swain starting out depends on your support as well as your competition normally i start out with Dorans blade, By the first time you B you should have enough for a B.F. sword and tier 1 boots( builds into beserker greaves). Then you should get an avarice blade for money gen for that little bit of extra gold push for quicker items (builds into an item you might want/need later) after that rush blood thirster then phantom dancer and after those items are done get the Infinity Edge by that time you should be well ahead and working on what needs to fit to the type of team you're fighting but in theory you should be okay to get another Phantom dancer. Lastly this item is up to you I personally enjoy the Black cleaver for its health and armor pen, and now you should be able to sell your money maker for which item you want to fill in the blank with rage blade sure why not botrk eh more health to ya!

Pros: Has a really high damage output and hard to get away from once you have them slowed and snared good CC for the team, can set up some nice ganking opportunities for the team jungler.
Cons: No real gap closers/ escape abilities very easy to gank if you're not watching for enemy ganks.

Farming you should do what all adc's do and last hit minions to get your CS up and whats good about this is your passive helps you recover a portion of your mana based off level for killing creeps and champs letting you sustain more in lain.

To wrap this up I'm going to leave you a few champs I've had trouble with in lane as a Swain ADC and who plays well with you on bot lane: Counters as I've seen vayne easily can tumble out of harms way and can lead to condemns. Varus is just annoying his abilities out reach yours making his poke alot better, Tristana has it in for you she has the leap and the push back as well as her healing reduction to make your ulti less of a threat.
Supports that compliment you would be Sona: heals and decent damage and one of my personal favorite ultis. Thresh: has the lantern to get you out and into places you need his hooks and ulti combo make for a devastating Wombo Combo. Lastly Leona + swain the enemy will be constantly stunned or slowed they match up perfect. All in all you should attempt Swain ADC his abilities allow for damage amplification and cc cant go wrong with that on an adc. (this was my first guide its rough but any advice is much appreciated!)