Volcanic Rupture can be used to set up zoning areas to threaten enemies.
Learning build paths of items can help quickly select upgrades in lane.
The order of your abilties matters! Try to optimize Brittle usage.
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 strategic Ornn vs. Karthus counter stats that may help us figure out the distinctions between these two champs. Ornn’s KDA ratio ([kills + assists] / deaths) of NaN is more than Karthus’s ratio of NaN, indicating that Ornn may be more central to his team's team fighting potential than Karthus..
Ornn often has a slightly smaller longest killing spree than his foe does. On average, he receives more damage than Karthus. This often reflects different amounts of tankyness, but it can also hint that the champion with higher HP has less agility and thus is unable to kite away from further damage when poked or engaged.
Both League of Legends champs are great. Both have their pros and cons. In League's current meta, Ornn usually wins when playing against Karthus, with a 53.6% win rate. Thus, Ornn makes a great counter to Karthus.
While Ornn does have a higher winrate than Karthus, when on opposite teams, Ornn also has a lower learning curve that makes him a less difficult character to learn and master. You should be be fine when picking Ornn into Karthus.
Additionally, Ornn has a good amount of CC and other utility, a similar amount to Karthus. This makes her just as valuable during team fights, especially when trying to counter champions with a ton of burst damage.
While there isn't a single best champion in League of Legends, in Ornn vs Karthus matchups, Ornn is the better champion with a noticably higher win rate, less champion complexity, and a similar amount of utility to help out your allies during team fights.
Ornn is a great counter for Karthus. You will do well by focussing your strategy on maximizing your CS and destroying objectives. If you can do that, you should be able to stand on your own as Ornn against Karthus.
If you would like to learn all of the intricacies of Ornn in order 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 tricks and insights into this matchup. If you mind the build and suggestions presented above, you should grow your win rate significantly and be that much closer to League of Legends pro players.
Ornn on average racks up more CS relative to Karthus. Champions who on average don't earn much CS usualy don't have to have much CS to be valuable teammates, such as supports. These kinds of champions are capable of scaling well off of their abilities and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, often require many items to be effective. In either case, try to exceed the values reported on this page to do well.
The most important items to focus on in your Ornn versus Karthus build include Sunfire Aegis, Thornmail, and The Unspoken Parasite. When Ornn incorporated at least these three items in his build, he did a lot better vs. Karthus than with many other typical counter builds. In fact, Ornn had an average win rate of 53.6% battling Karthus with these items in his kit.
To have the greatest likelihood of beating Karthus as Ornn, Ornn players should equip the Grasp of the Undying, Demolish, Bone Plating, Overgrowth, Biscuit Delivery, and Magical Footwear runes from the Resolve and Inspiration rune sets. Out of all the runes players chose for Ornn vs Karthus counter picks, this blending of runes resulted in the greatest win rate. Notably, these runes provided a 53.6% win rate overall.
If you need to see Ornn versus Karthus tips and counter builds for a a specific division, feel free to select one from the selection menu above. At first, the statistics and strategies given are calculated using all matches completed with these champs.