Pros:
- High damage early - mid game
- Awesome team fighter with 2 AOE abilities
- Mobile champion with hard CC
- Super lane-sustain

Cons:
- Damage falls off late game
- Can be kited easily (like his brother Nasus)
- Reliant on a good early game to be useful late game

Start with Boots and 3 Health Potion or Cloth Armor and 5 Health Potion depending on your lane. You will typically want to go boots, but against annoying harass champs like Gangplank and Yorick the extra pots and armor come in handy.

On your first trip back you have two options. You can either go 2 Doran's Blade or rush The Brutalizer. As of late, I usually go with the Doran's Blade, because it gives you a cheap source of health and damage in the early game.

On your next trip back, you need to get the Giant's Belt and finish your The Brutalizer. The health from the Giant's Belt will make you a monster and The Brutalizer is an awesome source of damage and armor penetration.

Your next trip back you must judge if you need level 2 boots or not. Usually I will buy boots if I know that team fights will start soon, because the cc reduction from Mercury Treads is awesome. NEVER buy Ionian Boots of Lucidity. Sure the cd reduction helps, but Mercury Treads and Ninja Tabi are far more useful in lane and in team fights. Get Ninja Tabi if you are against hard ad harassers like Gangplank or Vayne and Mercury Treads in all other situations. It is often smart to replace your Ninja Tabi with Mercury Treads.

At this point in the game, you want to focus on farming your Warmog's Armor and Atma's Impaler. After you finish these two key items, you have a variety of items you can purchase to complete your build.

Damage Items (if you are doing well and you already have a dedicated tank)
Black Cleaver, Wit's End, Youmuu's Ghostblade, Frozen Mallet, Infinity Edge, and Trinity Force
- Infinity Edge is only if you are really dominating
- Trinity Force is core on most off-tanks, but is less awesome on Renekton

Tank Items
Randuin's Omen, Force of Nature, Guardian's Angel

Summoner Spells
Flash and Ignite are your best options, but [Ghost], [Exhaust], and [Teleport] are viable. Ignite helps with early kills and Flash is an all around great spell, but any combination of the above spells is good.

Masteries
21-9-0 is my preferred setup, gearing to domination early game, but sometimes I run 9-21-0, making sure to take the CD reduction mastery.

Runes
Because Renekton is an early game champion, designed to hit hard early and tank late, I setup my runes and masteries to maximize his early damage. By building 3 AD marks, and 3 AD quints, I maximize my damage in the early - mid game. Renekton's job is to tank late game, not do damage. However, if you are still skeptical you can use the more traditional ArP marks and ArP quints.

Skill Sequence
Leveling Q first will maximize your sustain, while giving you an excellent source of fury and damage. After maxing Q, always take your E, because it lowers to CD, allowing you to harass more and be more mobile. Obviously, you want to take your ultimate whenever you can.

Renekton is a situational pick. He is the hard counter to Singed and Nasus, and survives against the harder solo-top champions like Yorick and Rumble. I don't recommend him as a first pick in ranked, but he is a great 4th or 5th pick to round of your lineup.

Early Game
Renekton is the god of early and mid game. After level 3 when you have all your spells, you want to use your E-Q-W-auto-E combo. Use fury on your Q for extra damage and healing during this phase. However if your jungler ganks for your, make sure you use a furious W, because the stun is huge with fury. Try not to push your lane with your spells, but be very very aggressive.

Mid Game
Ideally, you want to have your Warmog's Armor and be close to finishing your Atma's Impaler. You really want to finish the game now, because into late game your damage dies off. In team fights, jump the squishies and stick on them with your E. Many people forget about the armor reduction on a furious Dice. Try and E through the enemies at the beginning of the fight, because it will shred their armor.

Late Game
Late game, Renekton becomes a hard tank and a stun bot. However, he is still useful in fights. Pop your ult and spam your spells. Just try to be as big as you can and force them to focus you down.

An 'f' beside a letter denotes the use of fury in conjunction with the skill.

Healing
E - fQ- E

Harassment
E - fQ - fW - auto - E (fury can be used with either skill)
- It doesn't matter which spell you use with fury, because both have its benefits

Escaping Ganks
Run into bushes - W jungler - E - E
- Make good use of your double dash to escape from ganks

Team Fights
R - E - fQ - E - fW - spam skills
- remember to always target the carries