Lay Waste is very strong at farming minions and harassing enemy champions.
Ask your allies to help point out when you should use Requiem to get kills in different lanes.
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.
The Karthus Olaf synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Olaf, compared to his overall stats. Significant differences are areas of focus that highlight how his gameplay changes when paired with this other champion.
Overall, Karthus sees a large worsening in his KDA (ratio of kills and assists to deaths) when paired with Olaf. His KDA decreased from NaN to NaN. This worsening shows that Olaf helps Karthus perform not as well in ranked LoL games. Yet, the small difference demonstrates that this performance change is not very impactful.
When Karthus is an ally to Olaf, he gets a little drop in his complete damage dealt. This could signal that Olaf does not provide protection for him to dish out more damage or that his participation also helps extend the game's duration. Similarly, when Karthus is played with Olaf on the same side, he usually scores many fewer killing sprees compared to when he plays without Olaf. This is contrasting evidence that he is worse when playing alongside Olaf.
Additionally, when Karthus plays with Olaf on the same team, he often receives a little less damage than when he fights alone. Getting dealt not as much damage may mean that Olaf does a decent job of covering Karthus during team fights.
There is no ideal companion for Karthus that will no matter what be his ideal ally. Yet, overall, Olaf is a below average teammate for Karthus. By being on the same team as Karthus, he lowers their win rate by -1.5% to 45.8%. This proves that there is a bad bond between Karthus and Olaf that allows them to perform not as well together than alone.
Olaf has a much lower diffuclty than Karthus. That means you don't need to be cautious when finding Olaf allies to fight alongside, as they will require a much lower level of skill to fight well with you.
Playing alongside, you should see an overall large increase in your team’s ability to deal magic damage. Together, these champions can deal quite a lot of AP type damage.
Although, by pairing Karthus and Olaf together, you may not be granting your other allies very much tankyness. Plan to include other champs on your team that neutralizes this relative gap in this pairing's capabilities.
Regardless of the ability of your Olaf teammate, you should focus on increasing your income, staying alive by avoiding foolish fights, and clearing objectives. If you heed this simple advice, you will do well anyway.
To learn all of the intricacies of Karthus in order to pair well with Olaf during both the laning and mid / late game phases of League of Legends rounds, you should continue reading to pick up additional tips and tricks for this champion pairing. If you listen to the build and stats displayed above, you should grow your win rate significantly.
The ideal finished items to use in your Karthus and Olaf synergy build consist of Rabadon's Deathcap, Malignance, and Liandry's Torment. When Karthus combined at least these three pieces in his build, he did a lot better as an ally of Olaf than with many other typical builds. In fact, Karthus boasted an average winrate of 45.8% helping carry Olaf with these items in his kit.
To have the greatest probability of coming out on top against your oponents, you should take the Dark Harvest, Cheap Shot, Eyeball Collection, Ultimate Hunter, Gathering Storm, and Transcendence runes from the Domination and Sorcery rune sets. Out of all the runes players chose for this champion pairing, this order of runes resulted in the highest win rate. In fact, these runes provided a 45.8% winrate overall.
By default, tips, statistics, and builds on how to synergize Olaf with Karthus are given for all ranked divisions combined. If you would like to narrow the statistics and builds to a particular division, you may use the selection menu located at the top of this page.