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.
Be a bird!
In the lane, try to position your soldiers between the enemy's minions and the enemy champion. This way you can use them both to last hit and to project threat onto your lane opponent.
Be careful about putting down both of the soldiers stored by Arise! Unless you're going all-in, always have a soldier in your back pocket if you need to escape over a wall or if you misposition your other soldier and need damage now.
Think of Emperor's Divide as a defensive ability first and foremost. Use it when the enemy engages on you or your allies. Remember that your team can walk through the soldiers summoned by Emperor's Divide and use this to your advantage when enemy melee champions engage on you.
The Karthus Azir synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Azir, 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 very large drop in his KDA (ratio of kills and assists to deaths) when paired with Azir. His KDA went down from NaN to NaN. This fall shows that Azir helps Karthus perform poorer in ranked LoL games. Yet, the small difference shows that this performance change is not very impactful.
When Karthus is paired with Azir, he gets a small decrease in his total damage dealt. This change may indicate that Azir doesn't help cover for him to deal more damage or that his presence on the team also helps extend the round's duration. Similarly, when Karthus is played together with Azir on the same team, he usually scores many fewer killing sprees compared to when he plays alone. This is contrasting evidence that he is worse when playing alongside Azir.
Additionally, when Karthus plays with Azir on the same side, he typically takes a little more damage than when he plays alone. Getting dealt more damage could indicate that Azir does a poor job of covering Karthus in teamfights.
There is no ideal champion pairing for Karthus that will always be his best synergy. Yet, overall, Azir is a very bad companion for Karthus. By being on the same team as Karthus, he drops their win rate by -5.7% to 41.6%. This demonstrates that there is a very bad synergy between Karthus and Azir that results in them performing not as well together than without each other.
Azir has a greater difficulty than Karthus. That means Karthus players need to be careful when enlisting Azir comrades to go into battle on the same side as, as they will have to have a greater level of skill to fight well with you.
Playing together, you should observe an overall large increase in your team’s capability to deal magic damage. When paired, these champions can deal quite a lot of AP type damage.
In contrast, by aligning Karthus and Azir together, you probably will not be giving your other allies a great deal of tankyness. Make sure to have other champions on your team that offsets this disparity in this pairing's playstyle.
Regardless of the ability of your Azir teammate, you should focus on maximizing your gold income, outlasting your enemies, and taking down objectives. If you heed this simple advice, you should do well, regardless.
To truly master Karthus in order to work well with Azir during both the lane and mid / late game phases of League rounds, you should continue reading to learn additional tips and tricks for this champion pairing. If you mind the build and suggestions presented here, you should increase your win rate significantly.
The most crucial items to have in your Karthus and Azir synergy build consist of Malignance, Stormsurge, and Liandry's Torment. When Karthus included at least these three pieces in his build, he performed a lot better when fighting alongside Azir than with many other commonly used builds. In fact, Karthus had an average win rate of 41.6% when playing alongside Azir with this build.
To have the best chance of crushing your oponents, Karthus players should use the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Eyeball Collection, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Out of all the rune builds players picked for Karthus and Azir pairings, this combination of runes yielded the top win rate. Notably, these runes gave a 41.6% winrate overall.
By default, tips, statistics, and builds on how to pair Azir with Karthus are given for every ranked division. If you want to filter the statistics and builds to a specific player tier, you can use the selection menu located above.