Karthus can cast spells for a short duration after he is killed. Move away from his corpse to be safe.
Make sure you always have enough health to survive Requiem, even if you have to go back to the base more frequently to heal.
The stat comparisons shown on this page highlight some significant Viego vs. Karthus counter stats that may help you realize the distinctions between the pair. For instance, Viego’s KDA ratio ([kills + assists] / deaths) of NaN is more than Karthus’s ratio of NaN, demonstrating that Viego may be more central to their team's team fighting capacity than Karthus..
Viego usually has a similar longest killing spree as their opponent does. Typically, they takes more damage than Karthus. This often reflects different amounts of tankyness; however, it can also indicate that the champion with higher health has less mobility and thus is not able to flee from additional damage when poked or engaged.
Both League of Legends champs are great champions. Both champs have their pros and cons. In League's current meta, Viego usually wins when playing against Karthus, with a 51.5% win rate. Thus, Viego makes a good counter to Karthus.
While Viego does have a higher win rate than Karthus, when they face off with one another, Viego also has a lower level of difficulty that makes them a less challenging champ to learn. You should be careful when picking Viego into Karthus.
Moreover, Viego has some amount of utility and CC, a similar amount to Karthus. This makes her just as valuable during teamfights, especially when facing champions with a ton of burst damage.
While there isn't one best champion overall in League of Legends, in Viego vs Karthus matchups, Viego is the better champion with a higher win rate, less champion complexity, and a similar amount of utility to help out your allied champions during late stage team fights.
Viego is a decent counter for Karthus. You will do well by focussing your gameplay on maximizing your gold and cs and clearing objectives. If you do that, you should do very well as Viego against Karthus.
To truly master Viego to counter Karthus during both the early game 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 stats presented here, you will increase your win rate by a lot and be closer to League of Legends pro players.
Viego typically accumulates less CS as Karthus. Champions who on average don't acquire much CS often don't need much CS to be effective, such as support champions. 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, typically have to have a lot of items to be effective. In either case, try to do better than the numbers displayed on this page to do well.
The ideal items to use in your Viego versus Karthus build include Trinity Force, Wit's End, and Kraken Slayer. When Viego combined at least these three pieces in their build, they did significantly better when facing Karthus than with many other common counter builds. In fact, Viego boasted an average win rate of 51.5% battling Karthus with this build.
To have the highest probability of vanquishing Karthus as Viego, Viego players should use the Conqueror, Triumph, Legend: Alacrity, Coup de Grace, Cosmic Insight, and Magical Footwear runes from the Precision and Inspiration rune sets. Out of all the rune builds players used for Viego vs Karthus counterpicks, this mixture of runes yielded the best win rate. Moreover, these runes gave a 51.5% winrate overall.
By default, tips, stats, and builds on how to beat Karthus as Viego are shown for every ranked division. If you want to narrow the statistics and builds to a particular skill level, you may use the selection menu located earlier on the page.