On an uncharted continent beyond Valoran's grasping clutches, the conqueror named Olaf was born to a long tradition of soldiers unlike most others. Berserkers, as they tout themselves, are warriors who channel fury deep from their cores, unleashing pure and savage wrath upon their enemies. This fearsome evolution is a product of their unforgiving home, Lokfar - a barren tundra where all creatures must vie bitterly for every resource. Olaf belonged to a seafaring clan known for ruthlessly pillaging any and all villages within reach of their dragon-crested longboats. The last time he saw his icy home, Olaf was embarking on an expedition to pioneer and plunder a distant land known only to legend. However, while underway, a terrible storm sprung up and Olaf and his crew were thrown to the mercy of a roiling and pitiless sea.

His ship destroyed, his crew nowhere to be found, Olaf miraculously washed up untold miles from ''friendly'' waters on the foreign shores of Valoran, south of Demacia. This unfamiliar place stunned and frightened the Berserker, for Lokfar is not privy to such potent magicians. Approaching them, Olaf hoped that they could use their mysterious powers to send him back to his people. A bargain was struck. Olaf would use his awesome prowess as a warrior to serve the unusual wars of Valoran in the League of Legends, and in exchange the sorcerers would find him a way to return. Despite his participation in the League, Olaf knows better than to trust the ''finger wagglers'' that run the Institute of War. He deliberately keeps details of his life and home from them. After all, with enough information, they would most certainly find the Lokfarians and dominate them as they have dominated all of Valoran, keeping both quietly -- and unwittingly -- in their thrall.

Beware the war cry of the Berserker. What surges toward you is unyielding, free from the shackles of reason.

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Pros


+ Great initiator
+ Deals True Damage
+ Excellent slow through Undertow
+ Extremely fast jungler
+ Scales well with health items
+ "Brolaf"
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Cons


- Hurts himself with Reckless Swing
- Undertow difficult to land when new to Olaf.
- Makes you think you're invincible
- Crippled by Ignite

all the others olaf's cant vs this buid im lvl 24 but i can kill very easy the full runes 30's olafs.

pa los q no cacharon le podi sacar la rechucha a los otros wns q juegan esta wea con esta build menos los darius que cuestan un pokito. :D .

Skill Breakdown
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Berserker Rage, Olaf's Passive, increases his attack speed by 1% for every 1% of his own total health missing. This is an excellent passive for jungling since Olaf will take some damage his first few levels. Berserker Rage is truly underestimated, it can change the outcome of a fight if he is at a low percentage of health and nobody focuses him. Don't get too cocky though, because Olaf is not invincible.
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Undertow, Olaf's 'Q' Ability, Is a skillshot slow with an adjustable range, meaning you can choose how far the projectile will be thrown. (Roughly the same max range as Lee Sin's Sonic Wave / Resonating Strike) This skill, in my honest opinion, is what separates the good Olafs from the not so good ones. Undertow is Olaf's only form of CC, or Crowd Control. This skillshot will cause Olaf to throw an axe that will cause damage and leave an axe impaled to the ground, granting sight for a brief moment. This axe can be picked up if walked over and it will lower the cooldown of the ability by 4.5 seconds, however if it is left on the ground after 8 seconds Olaf will get it back automatically. This ability can make or break a gank. If an inexperienced Olaf throws his axe at maximum range even though the enemy champion is only half of the range away, you are putting your only way of CC out of combat range. Be careful when throwing using Undertow because you don't know when you'll get a chance to pick it back up.

Scaling:

Mana Cost: 55/60/65/70/75 per rank up
Attack Damage: 80/125/170/215/260 per rank up (+1 per bonus Attack Damage)
Slow(%): 24/28/32/36/40
Cooldown: 8 seconds flat

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Vicious Strikes, Olaf's 'W' Ability, is an activation that instantly grants him Attack Damage, Lifesteal, and Spell Vamp. The Lifesteal and Spell Vamp are only based on rank, but the Attack Damage scales off of Olaf's maximum health count. 1% of Olaf's health will convert to Attack Damage, similar to Atma's Impaler. Vicious Strikes is what makes jungling easy. Not only does the lifesteal keep you up but Smite scales off Spell Vamp, so if you activate this ability then use Smite, it will heal you.

Scaling:

Mana Cost: 40/45/50/55/60 per rank
Attack Damage: 7/14/21/28/35 per rank (+1% of Olaf's total health)
Lifesteal(%): 9/12/15/18/21 per rank
Spell Vamp(%): 9/12/15/18/21 per rank
Cooldown: 12 seconds flat

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Reckless Swing, Olaf's 'E' Ability, is a target nuke with similar range to Rammus' Puncturing Taunt. This ability causes true damage, meaning it ignores all resistances. This ability does excellent early game damage, which is why I max is first. Unfortunately, this ability also does excellent damage to yourself. Reckless Swing will hit both you and your target with true damage. The damage you do to yourself is significantly lower, but you need to be careful when using this at lower health, for you may get yourself killed.

Scaling:

Health Cost: 40/64/88/112/136 per rank
True Damage: 100/160/220/280/340 per rank
Cooldown: 8/7/6/5/4 seconds per rank

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Ragnarok, Olaf's Ultimate Ability, gives him a passive increase to armor penetration. Along with that, when activated, he clears all CC (like Cleanse) and is immune to all disables (Silence, Slow, Blind, etc.) for 6 seconds. This ability also grants Olaf bonus Armor and Magic Resistance on activation to make him an unstoppable force.

Scaling:

Mana Cost: 100/75/50 per rank
Armor Penetration: 10/20/30 passively per rank
Armor: 30/45/60 per rank
Magic Resist: 30/45/60 per rank
Cooldown: 100 seconds flat

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This is why I LOVE Olaf's ultimate!