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.
Trundle is very powerful at location-based combat. Try to draw him off of his Frozen Domain.
Make sure to get out of his Pillar of Ice as quickly as possible, as it significantly slows you down.
The stat comparisons shown here feature several vital Karthus vs. Trundle counter stats that may help you understand the differences between the two. As an example, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is better than Trundle’s ratio of NaN, showing that Karthus may be more central to his team's team fighting effectiveness than Trundle..
Karthus normally has a similar longest killing spree as his enemy does. On average, he takes less damage than Trundle. This often reflects different amounts of tankyness, yet it can also illustrate that the one champ has less agility and thus is not able to kite away from further damage when poked or engaged.
Both LoL champs are great champions. Both have their strengths, weaknesses, and counters. In the game's current meta, Karthus usually loses when facing off against Trundle, with a 44.5% win rate. Therefore, Karthus makes a bad counter to Trundle.
While Karthus does have a much lower win rate than Trundle, when on opposite teams, Karthus also has a greater learning curve that makes him a more difficult champ to pick up and master. You should be very concerned when picking Karthus into Trundleas his relative depth means you may not be able to reach his full potential without a lot of practice beforehand.
Furthermore, Karthus has some amount of utility and CC, a similar amount to Trundle. This makes her just as valuable during team fights, especially when facing champions with a lot of burst damage.
While there isn't one best champion in League of Legends, in Karthus vs Trundle matchups, Trundle is the better champion with a much lower win rate, more champion depth, and a similar amount of utility to help out your teammates during late stage team fights.
Karthus is a terribly counter for Trundle. Focus your play on maximizing your CS and clearing objectives. If you can do that, you should hold your own as Karthus against Trundle.
To learn all of the intricacies of Karthus to counter Trundle during both the lane 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 mind the build and stats presented above, you will increase your win rate significantly and be that much closer to League of Legends pro players.
Karthus on average accumulates less CS as Trundle. Champs who on average don't earn many minion kills often don't require much CS to be valuable teammates, such as sup champs. 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, usually require several high cost items to be effective. In either case, try to do better than the numbers displayed on this page to do well.
The most crucial items to use in your Karthus versus Trundle build include Rabadon's Deathcap, Stormsurge, and Liandry's Torment. When Karthus bought at least these three items in his build, he did much better when fighting Trundle than with many other commonly used builds. In fact, Karthus had an average win rate of 44.5% when playing against Trundle with these items in his kit.
To have the highest chance of vanquishing Trundle as Karthus, Karthus players should use the Dark Harvest, Cheap Shot, Eyeball Collection, Ultimate Hunter, Gathering Storm, and Transcendence runes from the Domination and Sorcery rune sets. Out of all the runes players picked for Karthus vs Trundle face-offs, this sequence of runes yielded the highest win rate. In fact, these runes averaged a 44.5% win rate overall.
If you would like to see Karthus x Trundle tips and builds for a a distinct rank, please choose one from the selection menu provided above. By default, the stats and strategies shown are calculated using all rounds with data with these champions.