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.
The stat comparisons provided here show several significant Karthus vs. Briar matchup statistics that may help us realize the distinctions between the pair. For instance, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is more than Briar’s ratio of NaN, indicating that Karthus may be more central to his team's team fighting potential than Briar..
Karthus often has a slightly smaller longest killing spree than his opponent does. Commonly, he takes less damage than Briar. This typically indicates differing health capacities, but it can also imply that the one champion has less agility and thus is unable to kite away from additional damage when engaged or poked.
Both League champs are great champions. Both champs have their pros and cons. In League's current meta, Karthus usually loses when taking on Briar, with a 44.9% win rate. Thus, Karthus makes a poor counter to Briar.
While Karthus does have a much lower winrate than Briar, when they face off with one another, Karthus also has a much greater level of difficulty that makes him a more difficult champion to learn. You should be very concerned when picking Karthus into Briaras his relative depth means that you may not be able to unleash his full potential without a lot of practice beforehand.
Moreover, Karthus has some amount of CC and other utility, a similar amount to Briar. This often makes her just as valuable during teamfights, especially when fighting champions with a lot of burst damage.
While there is not a single best champion in League of Legends, in Karthus vs Briar matchups, Briar is the better champion with a much lower win rate, more champion depth, and a similar amount of utility to help out your team members during late stage team fights.
Karthus is a trash counter for Briar. Make sure you focus your tactics on keeping up your gold and cs and destroying objectives. If you do that, you should do very well as Karthus against Briar.
If you would like to truly master Karthus to counter Briar during both the laning and mid / late game phases of League of Legends, you should keep reading to learn a few extra lessons on this matchup. If you mind the build and suggestions displayed here, you should grow your win rate significantly and be that much closer to League of Legends pro players.
Karthus often accumulates more CS as Briar. Champions who on average don't take many minion kills usualy don't require much CS to be valuable teammates, such as support champions. These kinds of champions are able to scale properly off of their abilities and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, often require several high cost items to be effective. In either situation, try to surpass the numbers reported on this page to do well.
The ideal items to focus on in your Karthus versus Briar build consist of Rabadon's Deathcap, Malignance, and Stormsurge. When Karthus included at least these three items in his build, he did a lot better against Briar than with most other common counter builds. In fact, Karthus boasted an average win rate of 44.9% battling Briar with this counter build.
To have the greatest likelihood of crushing Briar 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. Out of all the rune combinations players used for Karthus vs Briar battles, this composite of runes yielded the greatest win rate. In fact, these runes averaged a 44.9% winrate overall.
If you would like to view Karthus x Briar tips and matchup stats and build suggestions for a a particular rank, please choose one from the selection menu above. At first, the stats and build suggestions shown are calculated using every game with data with both champs.