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.
Karthus can cast spells for a short duration after he is killed. Move away from his corpse to be safe.
Make sure you always have enough health to survive Requiem, even if you have to go back to the base more frequently to heal.
The stats shown here highlight some important Olaf versus Karthus counter stats that can help you realize the distinctions between this pair of champs. As an example, Olaf’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Karthus’s ratio of NaN, demonstrating that Olaf may be more central to his team's team fighting capability than Karthus..
Olaf usually has a similar longest killing spree as his counter does. Commonly, he takes more damage than Karthus. This typically indicates different amounts of tankyness, but it can also indicate that the one champion has less agility and thus is unable to escape additional damage when engaged or poked.
Both League of Legends champions are great champions. Both have their strengths, weaknesses, and counters. In the game's current meta, Olaf usually wins when facing off against Karthus, with a 54.7% win rate. Thus, Olaf makes a great counter for Karthus.
While Olaf does have a much higher winrate compared to Karthus, when on opposite teams, Olaf also has a much lower difficulty level that makes him a less time consuming character to pick up and master. You should be be fine when picking Olaf into Karthus.
Moreover, Olaf also has almost no amount of utility and CC, a similar amount to Karthus. This often makes her just as valuable during teamfights, especially when facing champions with a ton of burst damage.
While there is not one best champion overall in League of Legends, in Olaf vs Karthus matchups, Olaf is the better champion with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your teammates during late stage team fights.
Olaf is a great counter to Karthus. Make sure you focus your play on increasing your gold and cs and clearing objectives. If you do that, you should be able to stand on your own as Olaf against Karthus.
If you would like to truly master Olaf to counter Karthus during both the lane and mid / late game phases of League of Legends, you should continue reading to gather a few extra lessons on this matchup. If you listen to the build and stats shown here, you will grow your win rate significantly and be that much closer to League of Legends pro players.
Olaf often gets more CS compared to Karthus. Champions who on average don't acquire many minion kills typically don't have to have much CS to be effective, such as support champions. They are capable of scaling properly off of their abilities and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, often have to have many items to be effective. In either situation, try to exceed the numbers reported on this page to do well.
The best items to focus on in your Olaf versus Karthus build include Sterak's Gage, Experimental Hexplate, and Ravenous Hydra. When Olaf incorporated at least these three pieces in his build, he performed a lot better when fighting Karthus than with many other typical builds. In fact, Olaf had an average win rate of 54.7% when countering Karthus with these items in his kit.
To have the highest likelihood of defeating Karthus as Olaf, Olaf players should use the Conqueror, Triumph, Legend: Alacrity, Last Stand, Biscuit Delivery, and Approach Velocity runes from the Precision and Inspiration rune sets. Out of all the runes players chose for Olaf vs Karthus counter picks, this mix of runes resulted in the best win rate. Notably, these runes averaged a 54.7% winrate overall.
By default, tips, statistics, and builds on how to beat Karthus as Olaf are displayed for all skill levels, merged. To scope the statistics and builds to a particular division, you can use the selection menu earlier on the page.