Olaf can combine Berserker Rage, Vicious Strikes, and Ragnarok at low life to become deceptively strong.
The bonus healing granted by Vicious Strikes amplifies your Life Steal from all sources as well as heals from allies.
Killing Tentacles whenever possible will make it much easier to win a fight against Illaoi.
When your spirit gets pulled out, fight back if you can. Dealing damage to Illaoi reduces the spirit's duration.
Avoid grouping up for Leap of Faith to reduce the number of Tentacles available to Illaoi.
The stat comparisons provided here show some significant Olaf against Illaoi counter stats that may help you interpret the differences and similarities between the pair. As an example, Olaf’s KDA ratio ([kills + assists] / deaths) of NaN is better than Illaoi’s KDA ratio of NaN, showing that Olaf may be more central to his team's team fighting capacity than Illaoi..
Olaf typically has a similar longest kill spree as his foe does. On average, he receives less damage than Illaoi. This commonly reflects differing health capacities, yet it can also illustrate that the champ with more HP has less mobility and thus is not able to kite away from additional damage when engaged or poked.
Both League champs are great. Both have their strengths, weaknesses, and counters. In the game's current meta, Olaf usually loses when trying to fight Illaoi, with a 44.4% win rate. Thus, Olaf makes a poor counter to Illaoi.
While Olaf does have a much lower winrate compared to Illaoi, when they face off with one another, Olaf also has a lower difficulty level that makes him a less challenging champ to develop with. You should expect to face a difficult match when picking Olaf into Illaoi.
Furthermore, Olaf also has almost no amount of CC and other utility, a similar amount to Illaoi. This makes her just as valuable during team fights, especially when trying to counter champions with a ton of burst damage.
While there isn't a single best champion overall in League of Legends, in Olaf vs Illaoi matchups, Illaoi is the better champ with a much lower win rate, less champion complexity, and a similar amount of utility to help out your teammates during late stage team fights.
Olaf is a terribly counter to Illaoi. Focus your actions on maximizing your gold and cs and destroying objectives. If you do that, you should be able to stand on your own as Olaf against Illaoi.
If you would like to learn all of the intricacies of Olaf in order to counter Illaoi during both the early game and mid / late game phases of League of Legends, you should keep reading to gather a few extra tricks and insights into this matchup. If you listen to the build and suggestions displayed here, you will increase your win rate by a lot and be closer to League of Legends pro players.
Olaf often picks up a similar amount of CS relative to Illaoi. Champs who on average don't take much CS often don't need much CS to be effective, such as support champions. These kinds of champions are able to scale well off of their skills, stats, and first items alone. Yet, champions with a lot of CS, such as hyper-carries, typically require several high cost items to be effective. In either case, try to do better than the numbers reported here to do well.
The top items to focus on in your Olaf versus Illaoi build include Sterak's Gage, Experimental Hexplate, and Ravenous Hydra. When Olaf used at least these three pieces in his build, he did significantly better versus Illaoi than with many other common counter builds. In fact, Olaf boasted an average win rate of 44.4% when playing against Illaoi with this counter build.
To have the greatest chance of beating Illaoi as Olaf, Olaf players should equip the Conqueror, Triumph, Legend: Alacrity, Last Stand, Approach Velocity, and Biscuit Delivery runes from the Precision and Inspiration rune sets. Of all the rune builds players picked for Olaf vs Illaoi fights, this composite of runes yielded the highest win rate. In fact, these runes averaged a 44.4% win rate overall.
By default, tips, statistics, and builds on how to beat Illaoi as Olaf are shown for all ranked divisions combined. To narrow the stats and builds to a particular rank, you can use the selection menu earlier in the counter matchup guide.