Before you throw the axe down so that you can hit as much as possible minions.
When your health bar is sure to finish your passive skill that gives you attack speed and at such times, use the fatal blow.

Throw Axe - Olaf hurls an ax at the desired location, dealing damage and slowing the unit through which the fly. If you then he will raise his weapon skill recovery time is shortened by 4.5 seconds.
Olaf throws an ax at the event, dealing 80/125/170/215/260 (+) i. physical damage. Weapon penetrates the targets, slowing it by 24/28/32/36/40% for 2.5 seconds.

If Olaf will raise the ax, the time of renewal of this ability is reduced by 4.5 seconds.

price
55/60/65/70/75 point. many
range
1000

Fatal blows - Damage from the attack Olaf are increased by the amount depending on his health. In addition, he gains life stealing spells and vampirism.
For 6 seconds damage from the attack Olaf are complementary to 7/14/21/28/35 (+ [1% maximum health]), and he gains 9/12/15/18/21% life stealing spells and vampirism.

price
40/45/50/55/60 point. many
range
700

The assassination Frenzy - Olaf attacks with such force that inflicts damage to its inevitable and the purpose.
Olaf brandishing axes, 100/160/220/280/340 inevitable Inflicts damage.

price
Cost 40/64/88/112/136 points. health
range
325

Ragnarok - Olaf is immune to the weakening and receive less damage.
Use: Removes all of Olaf's debilitating spells, and for the next 6 sec. hero becomes immune to the weakening and receives +30/45/60 points. armor and magic resistance.

Passive: Olaf gets +10/20/30 points. armor penetration.

price
100/75/50 point. many
range
400

Berserk Anger - For every 1% missing health Olaf attack speed increases by 1%. When your health bar is sure to finish your passive skill that gives you attack speed and at such times use fatal strike.

When you have low health, Olaf Berserker Rage can connect, fatal blows and Ragnarok to become a surprisingly powerful.

When you purchase items to enhance health, Olaf deals tremendous damage when the fatal blows are active.

The unexplored continent beyond Valoran, born conqueror named Olaf. Unlike the others, came from a family with a long tradition of the soldier. Berserkers, as it is called, are the warriors who accumulate the deepest layers of his fury, and then release it as a wild frenzy of anger and aimed directly at the enemy. The deadly effect of evolution received their harsh environment, Lokfar - barren tundra where all creatures have ruthlessly compete with each other for scarce resources. Olaf belonged to a clan known for sailing pillaging all the villages within reach of the long boat carved in the shape of dragons. The last time I saw Olaf his icy home, embarked on an expedition aimed at the population and robbing a distant land known only as the legends. When traveling violent squall surprised Olaf and his crew, abandoning them to the mercy of an angry and unforgiving sea.

His ship was destroyed, the crew was lost, and the miracle was abolished Olaf miles from the 'friendly' water right on an alien shore Valoran, south of Demacii. Berserker was horrified and bewildered by unfamiliar terrain, because Lokfar is inhabited by so powerful magicians. Olaf came to them in the hope that they could use their secret powers to send him to his people. The contents of the system. Olaf promised to use his amazing abilities brave, to serve the unique battles in Valoran in the ranks of League of Legends. In return, magicians promised to find for him the way home. Despite joining the League, Olaf knows he can not trust this 'threatening finger of the authorities' who manage the Institute of War. I intentionally did not reveal the details about his life and home. After having enough information, certainly would find Lokfarian and dominated their country, as they dominated Valoran, and then - quite unintentionally - oppressed nation.

Fear of war cry Berserker. That which is rushing towards you is relentless and endless chains of reason.