Hi and welcome to our Warwick-build. This build focuses on Hard AD and lifesteal. It might be an expensive build but when fully complete you can have over 600 AD!
This build is a different way of playing Warwick and you might need to get used to it, but in the end its really effective. This is my opinion and if you disagree please tell me why in the comment section!

Pro's
+ Extreme damage output
+ Humongous lifesteal
+ Your ultimate does insane damage
+ Great for picking out single targets
+ Once on them, they are screwed

Con's
- Low survivability
- Low attackspeed
- No bonus effects, just plain damage and lifesteal

21 points in Offence: I use this mainy to further utilise your damaging potential, also this increases you attackspeed.
9 points in Defence: This gives you the extra survivability you might just need.

You might consider putting the 9 points in Utility instead of Defence.
It can be useful since it gives mana regen and exp. boost. Though I prefer defence.

Main spells

Flash: My god I love this spell, its useful for chasing, running and even ganking! Summonerspell no. 1!
Flash also coöperates very good with your Infinite Duress.
Ignite: Just for kicking their ***es, also nice to use when preforming Infinite Duress

Other good spells:

Ghost: a good spell for the same goals as Flash, only Flash is better. Only pick if you do not have Flash.
Exhaust: Good in both offence and defence, you should pick this spell and Flash when you have trouble chasing people.

All the runes in this build are based on attackspeed, you'll need it, trust me...

Passive: Eternal Thirst: Each of Warwick's attacks will heal him for 6 Health. The amount restored increases by 6 at levels 7 and 13. Each successive attack against the same target will restore increasing amounts of health to Warwick. This is a neat ability because of the natural lifesteal, great for laning. Combine this with your lifesteal and AD, the result is overwhelming!

(q): Hungering Strike: Strikes an enemy for the greater value between 75/125/175/225/275 (+1) and 8/11/14/17/20% of the target's maximum Health as magic damage (can only do flat damage to monsters), and heals Warwick for 80% of the damage dealt.
Cost
70/80/90/100/110 Mana
Range
400 A nice ability since it will also do great damage on health-tanks, but your basic attack is your main weapon in this build so this attack won't be needed very much.

(w): Hunters Call: Warwick lets out a howl that inspires all nearby allied champions. This increases Warwick's attack speed by 40/50/60/70/80% and all nearby friendly champions' attack speed by half of that for 10 seconds.
Cost
35/35/35/35/35 Mana
Range
20 This is your main skill because of the attackspeed bonus, which you will need...

(e): Blood Scent: Warwick passively senses weakened enemy champions around him. The scent of blood sends him into a fury, causing him to move at incredible speeds.
Toggle: Warwick senses enemy champions under 50% life within 1500/2300/3100/3900/4700 distance of him; while he detects a low-health enemy, he gains 20/25/30/35/40% Movement Speed.
Cost
No Cost This skill is great for ganking and chasing. Once they have low health they are screwed.

Ultimate (r): Infinite Duress: Warwick lunges at an enemy Champion, suppressing his target and dealing magic damage for a few seconds.
Warwick lunges at an enemy Champion, suppressing his target for 1.8 seconds. While they are suppressed, Warwick deals 200/300/400(+ 166% of AD) as magicdamage over 1.8 sec. Warwick gains an additional 30% Lifesteal while performing Infinite Duress.
Cost
100/125/150 Mana
Range
700
God, I love this ultimate. With your AD this skill can deal over 1400 damage! WOOOT! This is the best initiation spell of the entire game, you preform Infinite Duress and either you or your ally finishes the job. NOTE: you can use Ignite while preforming Infinite Duress.

Start

Vampiric Scepter, nice for starting because of the lifesteal and it builds into a Bloodthirster, the core item.

Early game

Berserker's Greaves, make sure to rush these ASAP, you'll need the moventspeed but more importantly the attackspeed it provides. Together with your runes and Hunters Call you should have quite some attackspeed

B. F. Sword, I build 5 of these before building them into Bloodthirster, You can also choose to buy 1 B. F. Sword and then turn it into a Bloodthirster and so on.

Mid game

You should have at least 2 B. F. Sword or 1 Bloodthirster, try to get your B. F. Sword or Bloodthirster ASAP!

Your roles in the team with this build are Initiation and High-Damage Fighter. Which means you start teamfights and ganks and lead them with your damageoutput.
NOTE: Always pick out the weakest targets first and when you gank: put Blood Scent on when you actually start to attack, otherwise you will give yourself away because of the howling noise.

You'll want to be lvl 6 ASAP so you can gank with Infinite Duress, try to focus on minion kills first and only try to kill when you are certain that you can kill.

Ganking
Once you have Infinite Duress you can start ganking and killing. Hide in a brush and put Blood Scent out, to create the illusion that you are gone. Wait until the target comes close and Flash towards him and attack him with Infinite Duress.
NOTE: Flash is a great way of leading a gank and for positioning you.
NOTE: Don't forget to use Ignite while preforming Infinite Duress!

Teamfights
In teamfights always target the weakest target. Once that one is dead go to the second weakest and so on.

I hope you like this build and if you don't please comment!
Try this build before judging it and remember that you are now a fighter not a carry.

thanks,

DaBoBuilds
29-8-2011