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.
Ashe has very few defensive options, and she's a good target to gank.
Be wary of moving around the map alone if Ashe has not recently cast her Enchanted Crystal Arrow.
The stats shown on this page clarify some important Karthus against Ashe counter stats that can help you understand the distinctions between the two. Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is more than Ashe’s ratio of NaN, highlighting that Karthus may be more central to his team's team fighting effectiveness than Ashe..
Karthus usually has a similar longest kill spree as his enemy does. Typically, he takes more damage than Ashe. This typically indicates differing health capacities; however, it can also hint that the champion with more HP has less agility and thus is unable to escape further damage when poked or engaged.
Both League of Legends champions are great. Both have their pros and cons. In League's current meta, Karthus usually fairs equally well when taking on Ashe, with a 49.1% win rate. Therefore, Karthus makes an ok counter to Ashe.
While Karthus does have a lower win rate compared to Ashe, when they face off with one another, Karthus also has a much greater level of difficulty that makes him a more challenging character to develop with. You should be careful when picking Karthus into Asheas his relative depth means you may not be able to reach his full potential without a lot of practice beforehand.
Moreover, Karthus has some amount of utility and CC, a similar amount to Ashe. This makes her just as valuable during team fights, especially when trying to counter champions with a ton of burst damage.
While there is not a single best champion in League of Legends, in Karthus vs Ashe matchups, Ashe is the better champ with a similar 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 somewhat poor counter to Ashe. Make sure you focus your tactics on keeping up your CS and destroying objectives. If you do that, you should do very well as Karthus against Ashe.
To learn all of the intricacies of Karthus to counter Ashe during both the lane and mid / late game phases of League of Legends, you should keep reading to learn a few extra lessons on this matchup. If you listen to the build and tips displayed above, you will grow your win rate by a lot and be closer to League of Legends pro players.
Karthus most often gets less CS compared to Ashe. Champs who typically don't take much CS often don't need much CS to be effective, such as supports. They are able to scale properly off of their skills, stats, and first items alone. Yet, champions with a lot of CS, such as hyper-carries, usually need many items to be effective. In either situation, try to exceed the values reported on this page to do well.
The ideal items to prioritize in your Karthus versus Ashe build consist of Rabadon's Deathcap, Stormsurge, and Liandry's Torment. When Karthus used at least these three pieces in his build, he performed a lot better versus Ashe than with most other common counter builds. In fact, Karthus had an average winrate of 49.1% when countering Ashe with these items in his kit.
To have the highest likelihood of vanquishing Ashe 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 Ashe counter picks, this order of runes yielded the greatest win rate. Moreover, these runes provided a 49.1% winrate overall.
By default, tips, statistics, and builds on how to beat Ashe as Karthus are shown for all ranked divisions. If you want to filter the stats and builds to a specific player tier, you can use the selection menu located above.