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.
Vel'Koz has fairly low mobility and is vulnerable to ganks.
Vel'Koz is very dangerous if left alone in a fight. Try to focus him down early.
Life Form Disintegration Ray can be interrupted by stuns, silences and knockups.
The stat comparisons shown on this page highlight some valuable Karthus vs. Vel'Koz matchup statistics that can help us grasp the distinctions between the two. For instance, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is more than Vel'Koz’s KDA ratio of NaN, showing that Karthus may be more central to his team's team fighting potential than Vel'Koz..
Karthus normally has a similar longest kill spree as his enemy does. On average, he receives more damage than Vel'Koz. This commonly reflects different amounts of tankyness, but it can also show that the one champion has less mobility and thus is unable to escape additional harm when engaged or poked.
Both League of Legends champions are great champions. Both have their pros and cons. In League's current meta, Karthus usually loses when playing against Vel'Koz, with a 46.1% win rate. Thus, Karthus makes a poor counter to Vel'Koz.
While Karthus does have a lower winrate than Vel'Koz, when facing one another, Karthus also has a lower learning curve that makes him a less complex character to pick up and master. You should be very concerned when picking Karthus into Vel'Kozas his relative depth means you may not be able to unleash his full potential without a lot of practice beforehand.
Furthermore, Karthus has some amount of CC and other utility, a similar amount to Vel'Koz. This makes her just as valuable during team fights, especially when trying to counter champions with a lot of burst damage.
While there is not one best champion for every situation in League of Legends, in Karthus vs Vel'Koz matchups, Vel'Koz is the better champ with a much lower win rate, less champion complexity, and a similar amount of utility to help out your allies during teamfights.
Karthus is a bad counter to Vel'Koz. Make sure you focus your play on keeping up your gold income and taking out objectives. If you can do that, you should be able to stand on your own as Karthus against Vel'Koz.
If you would like to truly master Karthus to counter Vel'Koz during both the lane and mid / late game phases of League of Legends, you should keep reading to pick up a few extra tricks and insights into this matchup. If you pay attention to the build and tips displayed above, you will increase your win rate significantly and be that much closer to League of Legends pro players.
Karthus on average accumulates a similar amount of CS relative to Vel'Koz. Champs who typically don't earn much CS typically don't have to have much CS to be valuable teammates, such as support champions. They are capable of scaling properly off of their abilities and first items alone. Yet, champions with a lot of CS, such as hyper-carries, often need a lot of items to be effective. In either situation, try to do better than the numbers shown here to do well.
The best items to use in your Karthus versus Vel'Koz build include Malignance, Void Staff, and Liandry's Torment. When Karthus combined at least these three items in his build, he did much better versus Vel'Koz than with many other common counter builds. In fact, Karthus had an average winrate of 46.1% when countering Vel'Koz with this counter build.
To have the best probability of coming out on top against Vel'Koz as Karthus, you 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 we have analyed for Karthus vs Vel'Koz clashes, this combination of runes resulted in the best win rate. Moreover, these runes gave a 46.1% win rate overall.
By default, tips, stats, and builds on how to beat Vel'Koz as Karthus are displayed for all skill levels combined. If you want to narrow the stats and builds to a specific division, you may use the selection menu above.