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.
Rammus often stacks high Armor, leaving him especially vulnerable to caster damage while not in Defensive Ball Curl.
Pay particular attention to when his Defensive Ball Curl is off. Rammus has much lower stats than a normal tank when he's out of the stance.
The stats shown on this page highlight some important Karthus versus Rammus matchup statistics that may help you interpret the differences and similarities between the pair. For instance, Karthus’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Rammus’s ratio of NaN, highlighting that Karthus may be more central to his team's team fighting effectiveness than Rammus..
Karthus usually has a slightly larger longest killing spree than his counter does. Commonly, he receives less damage than Rammus. This is usually reflective of different amounts of tankyness; however, it can also imply that the champ with increased health has less agility and thus is unable to kite away from additional damage when poked or engaged.
Both League champions are great. Both have their pros and cons. In the game's current meta, Karthus usually fairs equally well when trying to fight Rammus, with a 49.7% win rate. Therefore, Karthus makes an ok counter to Rammus.
While Karthus does have a lower win rate than Rammus, when they face off with one another, Karthus also has a greater difficulty level that makes him a more difficult champion to pick up and master. You should be careful when picking Karthus into Rammusas his relative depth means you may not be able to unleash his full potential without a significant amount of practice beforehand.
Additionally, Karthus has some amount of CC and other utility, a similar amount to Rammus. This makes her just as valuable during team fights, especially when trying to counter champions with a lot of burst damage.
While there is not one best champion in League of Legends, in Karthus vs Rammus matchups, Rammus is the better champion with a similar win rate, more champion depth, and a similar amount of utility to help out your team members during late stage team fights.
Karthus is a somewhat poor counter to Rammus. Focus your play on increasing your gold and cs and taking out objectives. If you are able to do that, you should be able to stand on your own as Karthus against Rammus.
If you would like to learn all of the intricacies of Karthus in order to counter Rammus during both the lane 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 listen to the build and stats displayed above, you should grow your win rate significantly and be that much closer to League of Legends pro players.
Karthus typically racks up more CS compared to Rammus. Champions who typically don't earn much CS often don't require much CS to be effective, such as sup champs. They are able to scale properly off of their abilities and first items alone. Yet, champions with large amounts of CS, such as hyper-carries, typically need many items to be effective. In either case, try to surpass the values shown on this page to do well.
The most important items to prioritize in your Karthus versus Rammus build include Rabadon's Deathcap, Malignance, and Shadowflame. When Karthus combined at least these three items in his build, he performed much better when fighting Rammus than with many other common item sets. In fact, Karthus had an average win rate of 49.7% when countering Rammus with these items in his kit.
To have the highest probability of beating Rammus as Karthus, Karthus players should take the First Strike, Magical Footwear, Future's Market, Cosmic Insight, Eyeball Collection, and Ultimate Hunter runes from the Inspiration and Domination rune sets. Of all the runes players picked for Karthus vs Rammus face-offs, this composite of runes yielded the highest win rate. In fact, these runes averaged a 49.7% win rate overall.
If you want to view Karthus versus Rammus tips and matchup stats and build suggestions for a a specific division rank, feel free to choose one from the selection menu above. By default, the statistics and guides displayed are calculated using all rounds played with these champs.