Grand Challenge allows Fiora to take down even the most durable opponents and then recover if successful, so do not hesitate to attack the enemy's front line.
Thanks to Duelist's Dance, Fiora excels at quick trades. Use the Move Speed boost from striking a Vital to escape unscathed or set up for the next one.
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 provided here show some critical Fiora against Karthus counter statistics that may help you understand the differences and similarities between this pair of champs. For instance, Fiora’s KDA ratio ([kills + assists] / deaths) of NaN is better than Karthus’s KDA ratio of NaN, highlighting that Fiora may be more central to her team's team fighting capacity than Karthus..
Fiora usually has a similar longest kill spree as her foe does. Typically, she takes more damage than Karthus. This is usually reflective of differing health capacities, yet it can also imply that the champ with higher HP has less mobility and thus is unable to kite away from additional harm when engaged or poked.
Both League of Legends champions are great. Both champs have their pros and cons. In League's current meta, Fiora usually wins when playing against Karthus, with a 53.0% win rate. As a result, Fiora makes a good counter to Karthus.
While Fiora does have a higher winrate than Karthus, when facing one another, Fiora also has a much lower level of difficulty that makes her a less complex character to develop with. You should be be fine when picking Fiora into Karthus.
Furthermore, Fiora also has almost no amount of CC and other utility, a similar amount to Karthus. This often makes her just as valuable during team fights, especially when fighting champions with a ton of burst damage.
While there isn't one best champion for every situation in League of Legends, in Fiora vs Karthus matchups, Fiora is the better champ with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your allied champions during team fights.
Fiora is a good counter for Karthus. Focus your tactics on keeping up your gold income and destroying objectives. If you do that, you should do very well as Fiora against Karthus.
If you would like to learn all of the intricacies of Fiora to counter Karthus during both the early game 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 suggestions shown above, you will grow your win rate by a lot and be that much closer to League of Legends pro players.
Fiora typically gets more CS as Karthus. Champions who on average don't take many minion kills often don't require much CS to be valuable teammates, such as sup champs. They are able to scale well off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, usually require many items to be effective. In either case, try to exceed the numbers reported on this page to do well.
The most important items to use in your Fiora versus Karthus build include Sterak's Gage, Ravenous Hydra, and Trinity Force. When Fiora bought at least these three pieces in her build, she did much better when facing Karthus than with many other typical builds. In fact, Fiora boasted an average win rate of 53.0% when countering Karthus with this build.
To have the best probability of beating Karthus as Fiora, Fiora players should use the Grasp of the Undying, Demolish, Second Wind, Unflinching, Manaflow Band, and Scorch runes from the Resolve and Sorcery rune sets. Out of all the rune combinations that we analyzed for Fiora vs Karthus battles, this blending of runes resulted in the highest win rate. Moreover, these runes gave a 53.0% winrate overall.
By default, tips, stats, and builds on how to beat Karthus as Fiora are given for all ranked divisions combined. To narrow the statistics and builds to a specific player tier, you may use the selection menu earlier in the counter matchup guide.