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.
Vi cannot be stopped while using her ult. Remember to save your displacement effects until after she's done charging.
A fully charged Vault breaker deals double damage. If you see Vi start to charge you should back off or try to dodge it.
Vi will shred your Armor and gain Attack Speed if she manages to hit you three times in a row. Try not to engage in extended brawls with her.
The stats provided here highlight some critical Karthus vs. Vi counter statistics that may help us interpret the differences between the two. As an example, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is better than Vi’s ratio of NaN, showing that Karthus may be more central to his team's team fighting potential than Vi..
Karthus usually has a similar longest killing spree as his opponent does. Commonly, he takes a similar amount of damage to Vi. This typically indicates differing health capacities, but it can also hint that the champion with more HP has less mobility and thus is not able to kite away from additional damage when poked or engaged.
Both League champions are great. Both champs have their strengths, weaknesses, and counters. In League's current meta, Karthus usually loses when facing off against Vi, with a 44.6% win rate. Therefore, Karthus makes a poor counter to Vi.
While Karthus does have a much lower win rate compared to Vi, when facing one another, Karthus also has a much greater learning curve that makes him a more challenging champ to develop with. You should expect to face a difficult match when picking Karthus into Vias his relative depth means you may not be able to unleash his full potential without a significant amount of practice beforehand.
Additionally, Karthus also has some amount of CC and other utility, a similar amount to Vi. This often makes her just as valuable during teamfights, especially when fighting champions with a ton of burst damage.
While there is not one best champion in League of Legends, in Karthus vs Vi matchups, Vi is the better champion with a much lower win rate, more champion depth, and a similar amount of utility to help out your allied champions during late stage team fights.
Karthus is a bad counter for Vi. Focus your actions on keeping up your CS and destroying objectives. If you do that, you should hold your own as Karthus against Vi.
If you would like to learn all of the intricacies of Karthus in order to counter Vi during both the early game and mid / late game phases of League of Legends, you should keep reading to pick up a few extra tips and tricks for this matchup. If you mind the build and suggestions displayed here, you should increase your win rate significantly and be that much closer to League of Legends pro players.
Karthus usually racks up more CS compared to Vi. Champions who on average don't take much CS typically don't need 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, champions with large amounts of CS, such as hyper-carries, typically have to have many items to be effective. In either case, try to exceed the numbers reported on this page to do well.
The most crucial items to focus on in your Karthus versus Vi build include Rabadon's Deathcap, Malignance, and Stormsurge. When Karthus combined at least these three pieces in his build, he performed much better against Vi than with many other common item sets. In fact, Karthus boasted an average winrate of 44.6% when playing against Vi with this counter build.
To have the best probability of defeating Vi as Karthus, Karthus players should equip 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 runes players chose for Karthus vs Vi matchups, this composite of runes resulted in the greatest win rate. Notably, these runes provided a 44.6% winrate overall.
If you need to see Karthus x Vi tips and counter stats for a a specific rank, feel free to select one from the selection menu displayed above. By default, the stats and build suggestions displayed are calculated using every match run with both champs.