On a faraway world, Renekton was born a member of a race of bestial guardians created to serve as the rulers and protectors of their people. Alongside his brother Nasus, Renekton oversaw the upkeep of the Great Library, which served as both a vault of ancient knowledge and the repository of the teachings of the Cycle of Life and Death. While the enlightened Nasus taught those scholars who came to study, Renekton served as the Great Library's gatekeeper. He could sense the true natures of those who sought Nasus' teachings, and he sent away those with dark ambitions. Over time, however, his repeated exposure to this evil infected his mind. He grew furious with the malevolence in the hearts of men, and as he descended deeper into madness, he discovered he could quell the fury by cutting the evil from the men who possessed it. Unfortunately, the relief was as short-lived as the subjects, and the ''butcher's rage'', as it came to be known, would resurge even stronger.

Consumed by his anger, Renekton turned on the one being who could defeat him -- his own brother. Nasus pleaded with Renekton to see reason. Realizing that he was beyond redemption, the despondent Nasus valiantly struck down his wayward sibling. Defenseless, Renekton waited eagerly for death's release. It never came. He was spared when summoners from the League of Legends claimed his brother. Caught in the wake of this powerful spell, Renekton tumbled for what seemed like ages between realities. When he finally emerged, he fell deep into the sewers of Zaun. Insane with fury, Renekton languished in his newfound home, driven senseless by his rage. That is until, by happenstance, he caught a familiar scent on the air. Believing that the familiar scent would guide him to the solace which was fading from his memory, he traced his brother to the Institute of War.

''My brother has become hollow. Full of rage, but empty.'' -- Nasus, the Curator of the Sands.

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PROs:
+Very good lategame
+ Ruthless Predator is good for first blood
+High damage
+Good in 1on1 or even 1on2
+Chasing or escaping with Slice and Dice
+No Mana!

CONs:
-No tank, you will die instantly if you get focused
-Still weak to Crowd Control (slow, stun...), because you dont use Mercury's Treads
-Quite weak before level 6
-Fury! Without your Dominus it refills with hits only- you might die in some teamfights

Marks
Greater Mark of Desolation x9,
beacause your attacks do normal damage and more armor penetration means more damage.
Seals
Greater Seal of Evasion x9,
because you're melee dude, evasion might save your ***.
Glyphs
Greater Glyph of Cooldown Reduction x9,
because you got no mana - so it's useful to get the cooldown reduction cap.
Quints
Greater Quintessence of Desolation x3,
same as the mark's description (gives you even more armor pen.)

Core Item build:
Doran's Blade
Ionian Boots of Lucidity
Phage
The Brutalizer

Standard build:
Ionian Boots of Lucidity
Black Cleaver
Youmuu's Ghostblade
Bloodthirster
Frozen Mallet
Guardian Angel

Enemy team: Physical (Damage with normal attacks)
Ninja Tabi
Black Cleaver
Youmuu's Ghostblade
Bloodthirster
Frozen Mallet
Thornmail

Enemy team: Magical (Damage with spells)
Mercury's Treads
Black Cleaver
Youmuu's Ghostblade
Bloodthirster
Frozen Mallet
Force of Nature

On a lane:

Well it's quite easy. You can use your abilities as often as you like - you got no mana.
For you that means you can last hit with your Cull the Meek or heal yourself if you got 50+ fury.
But NEVER waste your Slice and Dice and Ruthless Predator for creeping, if (!) youre laning solo/ theres the danger that your opponents will start an attack.

Harras (inflict damage to your enemy without killing him instantly):

Quite easy: Slice and Dice to your opponent, Ruthless Predator for stunning, Cull the Meek and then Slice and Dice out again.
(E-W-Q-E)
WARNING!
NEVER harras in tower range or if your opponents got CC(Crowd Control)!

Teamfights!

Well, in teamfights it looks like this:
First you use Dominus (but don't scare them away!)
Then you Slice and Dice to the squishiest one, Ruthless Predator, Cull the Meek and Slice and Dice to follow(last hit) or escape.
(R-E-W-Q-E) OR(!) if you want to be safe:
(R-W-E-Q-E) - Ulti, Prepare Stun, Slice in and HIT, Cull and Dice out / follow

Thank you for reading my guide, I hope it helped you to kick some arses ;P
This is the first build of mine, thats quite good I think and I'd be happy if you help me to improve it by

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