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.
Kill all of Zac's bloblets when he splits apart to stop him from reforming.
Silences, stuns, roots and knockups will all interrupt Zac when he is charging Elastic Slingshot.
Zac heals from the goo that separates from him. You can crush the goo pieces by stepping on them.
The stats shown on this page clarify several vital Karthus versus Zac counter stats that can help you grasp the distinctions between this pair of champs. Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is more than Zac’s ratio of NaN, highlighting that Karthus may be more central to his team's team fighting potential than Zac. This observation is largely caused by the differences in deaths.
Karthus usually has a slightly larger longest killing spree than his counter does. Commonly, he takes less damage than Zac. This typically indicates differing health capacities, yet it can also illustrate that the one champion has less mobility and thus is unable to kite away from additional damage when engaged or poked.
Both League of Legends champions are great. Both champs have their strengths, weaknesses, and counters. In League's current meta, Karthus usually loses when taking on Zac, with a 42.9% win rate. As a result, Karthus makes a poor counter for Zac.
While Karthus does have a much lower win rate compared to Zac, when facing one another, Karthus also has a lower difficulty level that makes him a less difficult champion to pick up and master. You should be very concerned when picking Karthus into Zacas his relative depth means you may not be able to reach his full potential without a lot of practice beforehand.
Additionally, Karthus also has some amount of CC and other utility, a similar amount to Zac. This makes her just as valuable during teamfights, especially when trying to counter champions with a ton of burst damage.
While there isn't a single best champion in League of Legends, in Karthus vs Zac matchups, Zac is the better champ with a much lower win rate, less champion complexity, and a similar amount of utility to help out your allied champions during team fights.
Karthus is a bad counter for Zac. Make sure you focus your strategy on maximizing your gold and cs and taking out objectives. If you do that, you should hold your own as Karthus against Zac.
To truly master Karthus in order to counter Zac during both the laning and mid / late game phases of League of Legends, you should continue reading to gather a few extra tips and tricks for this matchup. If you mind the build and tips shown here, you should increase your win rate significantly and be closer to League of Legends pro players.
Karthus most often picks up more CS relative to Zac. Champions who typically don't get many minion kills typically don't have to have much CS to be effective, such as sup champs. These kinds of champions are capable of scaling 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 many items to be effective. In either situation, try to surpass the numbers shown on this page to do well.
The most important items to use in your Karthus versus Zac build include Rabadon's Deathcap, Malignance, and Shadowflame. When Karthus used at least these three items in his build, he did a lot better versus Zac than with most other commonly used counter builds. In fact, Karthus boasted an average win rate of 42.9% when countering Zac with these items in his kit.
To have the greatest chance of crushing Zac as Karthus, Karthus players should take 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 builds players picked for Karthus vs Zac counter picks, this sequence of runes resulted in the greatest win rate. In fact, these runes averaged a 42.9% win rate overall.
By default, tips, statistics, and builds on how to beat Zac as Karthus are displayed for every ranked division. To narrow the statistics and builds to a distinct player tier, you can use the selection menu located at the top of this page.