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.
Spread out when you see Sona so she can't make your entire team dance.
Kill Sona first, as she will heal up her team if left alone for too long.
The stat comparisons shown on this page clarify some important Karthus vs. Sona counter statistics that may help us realize the differences between these two champions. As an example, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Sona’s ratio of NaN, showing that Karthus may be more central to his team's team fighting capability than Sona. This observation is in large part fueled by the difference in kills.
Karthus usually has a much larger longest kill spree than his enemy does. Commonly, he receives more damage than Sona. This typically indicates differing health capacities, but it can also hint that the champion with increased HP has less mobility and thus is unable to kite away from further harm when poked or engaged.
Both League champs are great. Both champs have their strengths, weaknesses, and counters. In League's current meta, Karthus usually loses when facing off against Sona, with a 43.6% win rate. Thus, Karthus makes a poor counter to Sona.
While Karthus does have a much lower winrate compared to Sona, when on opposite teams, Karthus also has a much greater level of difficulty that makes him a more difficult champ to pick up and master. You should be very concerned when picking Karthus into Sonaas his relative depth means you may not be able to reach his full potential without a significant amount of practice beforehand.
Additionally, Karthus also has some amount of utility and CC, a similar amount to Sona. This makes her just as valuable during teamfights, especially when fighting champions with a ton of burst damage.
While there is not a single best champion for every situation in League of Legends, in Karthus vs Sona matchups, Sona is the better champion with a much lower win rate, more champion depth, and a similar amount of utility to help out your allies during teamfights.
Karthus is a garbage counter to Sona. Focus your strategy on maximizing your CS and clearing objectives. If you can do that, you should hold your own as Karthus against Sona.
To learn all of the intricacies of Karthus to counter Sona during both the laning and mid / late game phases of League of Legends, you should keep reading to pick up a few extra lessons on this matchup. If you listen to the build and suggestions presented here, you will grow your win rate significantly and be closer to League of Legends pro players.
Karthus usually accumulates more CS as Sona. Champs who on average don't acquire many minion kills often don't need much CS to be effective, such as supports. They are able to scale properly off of their skills, stats, and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, often have to have several high cost items to be effective. In either situation, try to do better than the values displayed here to do well.
The most important items to have in your Karthus versus Sona build include Malignance, Shadowflame, and Stormsurge. When Karthus combined at least these three items in his build, he performed much better when fighting Sona than with most other commonly used counter builds. In fact, Karthus boasted an average winrate of 43.6% battling Sona with this build.
To have the greatest probability of defeating Sona as Karthus, you 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. Of all the rune combinations players chose for Karthus vs Sona clashes, this composite of runes resulted in the greatest win rate. Notably, these runes gave a 43.6% winrate overall.
If you would like to get Karthus vs Sona tips and builds for a a distinct rank, please select one from the selection menu shown above. At first, the statistics and strategies given are calculated using all rounds finished with these champions.