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.
Buying an item with Grievous Wounds will make Swain much easier to kill during his Demonic Ascension.
Swain's passive is very potent if you are immobilized. Make sure to be extra careful around enemies who have immobilizing effects.
High mobility counters all of Swain's basic abilities: Death's Hand does more damage the closer he is, Vision of Empire has a very long delay and Nevermove must start returning back to him to be dangerous.
The stat comparisons shown here feature several vital Karthus vs. Swain matchup stats that may help you explain the differences and similarities between the pair. For instance, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is more than Swain’s KDA ratio of NaN, indicating that Karthus may be more central to his team's team fighting capacity than Swain..
Karthus often has a similar longest kill spree as his counter does. Commonly, he receives less damage than Swain. This typically indicates different amounts of tankyness, yet it can also imply that the champ with higher HP has less agility and thus is unable to escape further damage when engaged or poked.
Both League of Legends champions are great champions. Both have their pros and cons. In the game's current meta, Karthus usually loses when facing off against Swain, with a 44.3% win rate. Therefore, Karthus makes a poor counter for Swain.
While Karthus does have a much lower win rate compared to Swain, when on opposite teams, Karthus also has a lower difficulty level that makes him a less challenging champ to learn and master. You should be very concerned when picking Karthus into Swainas his relative depth means you may not be able to unleash his full potential without a lot of practice beforehand.
Moreover, Karthus also has some amount of CC and other utility, a similar amount to Swain. This makes her just as valuable during teamfights, especially when trying to counter champions with a lot of burst damage.
While there isn't one best champion in League of Legends, in Karthus vs Swain matchups, Swain is the better champion with a much lower win rate, less champion complexity, and a similar amount of utility to help out your allied champions during late stage team fights.
Karthus is a terribly counter for Swain. Make sure you focus your gameplay on keeping up your CS and destroying objectives. If you can do that, you should be able to stand on your own as Karthus against Swain.
If you would like to truly master Karthus to counter Swain during both the laning and mid / late game phases of League of Legends, you should continue reading to pick up a few extra tips and tricks for this matchup. If you listen to the build and stats presented above, you will grow your win rate significantly and be closer to League of Legends pro players.
Karthus most often gets a similar amount of CS compared to Swain. Champions who on average don't get much CS usualy 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 a lot of CS, such as hyper-carries, usually require several high cost items to be effective. In either case, try to exceed the values displayed on this page to do well.
The top items to prioritize in your Karthus versus Swain 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 Swain than with many other commonly used builds. In fact, Karthus boasted an average winrate of 44.3% when countering Swain with this build.
To have the greatest probability of defeating Swain 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 players chose for Karthus vs Swain clashes, this order of runes yielded the highest win rate. In fact, these runes averaged a 44.3% winrate overall.
By default, tips, statistics, and builds on how to beat Swain as Karthus are displayed for all ranked divisions. To narrow the stats and builds to a distinct player tier, you can use the selection menu at the top of this page.