Use Demacian Standard as a scouting tool when worried about incoming enemies.
You can use the Dragon Strike / Demacian Standard combo to get out of your own Cataclysm arenas.
Split your basic attacks on different champions at the beginning of fights to maximize damage.
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 stat comparisons shown on this page clarify some vital Jarvan IV against Karthus matchup stats that can help you explain the differences between the pair. As an example, Jarvan IV’s KDA ratio ([kills + assists] / deaths) of NaN is more than Karthus’s KDA ratio of NaN, demonstrating that Jarvan IV may be more central to his team's team fighting potential than Karthus..
Jarvan IV usually has a similar longest killing spree as his foe does. On average, he receives more damage than Karthus. This often reflects differing health capacities; however, it can also indicate that the one champ has less mobility and thus is unable to kite away from further damage when engaged or poked.
Both League champs are great champions. Both have their strengths, weaknesses, and counters. In League's current meta, Jarvan IV usually wins when taking on Karthus, with a 52.4% win rate. Thus, Jarvan IV makes a good counter to Karthus.
While Jarvan IV does have a higher winrate than Karthus, when facing one another, Jarvan IV also has a lower level of difficulty that makes him a less complex champion to learn and master. You don't need to be too worried when picking Jarvan IV into Karthus.
Moreover, Jarvan IV also has some amount of utility and CC, a similar amount to Karthus. This often makes her just as valuable during team fights, especially when fighting champions with a ton of burst damage.
While there is not a single best champion overall in League of Legends, in Jarvan IV vs Karthus matchups, Jarvan IV is the better champ with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your allied champions during teamfights.
Jarvan IV is an above average counter for Karthus. Make sure you focus your tactics on keeping up your CS and clearing objectives. If you are able to do that, you should be able to stand on your own as Jarvan IV against Karthus.
If you would like to learn all of the intricacies of Jarvan IV in order to counter Karthus during both the lane and mid / late game phases of League of Legends, you should keep reading to learn a few extra tricks and insights into this matchup. If you pay attention to the build and suggestions displayed here, you should increase your win rate significantly and be that much closer to League of Legends pro players.
Jarvan IV most often accumulates less CS compared to Karthus. Champs who on average don't take much CS typically don't require much CS to be valuable teammates, such as sup champs. These kinds of champions are able to scale properly off of their skills, stats, and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, usually require several high cost items to be effective. In either case, try to surpass the values shown on this page to do well.
The most crucial items to have in your Jarvan IV versus Karthus build consist of Sterak's Gage, Spear of Shojin, and Sundered Sky. When Jarvan IV bought at least these three pieces in his build, he did much better when facing Karthus than with most other commonly used builds. In fact, Jarvan IV had an average winrate of 52.4% battling Karthus with this counter build.
To have the highest likelihood of defeating Karthus as Jarvan IV, Jarvan IV players should use the Conqueror, Triumph, Legend: Alacrity, Coup de Grace, Cosmic Insight, and Magical Footwear runes from the Precision and Inspiration rune sets. Of all the rune builds players chose for Jarvan IV vs Karthus clashes, this set of runes resulted in the best win rate. Moreover, these runes averaged a 52.4% winrate overall.
By default, tips, stats, and builds on how to beat Karthus as Jarvan IV are displayed for all ranked divisions combined. If you want to scope the statistics and builds to a distinct player tier, you should use the selection menu located at the top of this page.