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.
Try to knock enemies back into your towers with Explosive Cask.
Try to combo Body Slam with Explosive Cask to set up kills for your team.
The damage reduction from Drunken Rage is applied when you start drinking, try to use it when you see damage coming your way.
The Karthus Gragas synergy stats shown here demonstrate the areas of his gameplay that do better (or worse) when paired with Gragas, compared to his overall stats. Significant differences are areas of focus that highlight how his gameplay changes when paired with this other champion.
Overall, Karthus sees a very large drop in his KDA (ratio of kills and assists to deaths) when paired with Gragas. His KDA went down from NaN to NaN. This fall shows that Gragas helps Karthus perform not as well in ranked LoL games. Yet, the small difference proves that this performance change is not very impactful.
When Karthus is paired with Gragas, he observes a marginal improvement in his full damage dealt. This difference may signal that Gragas helps provide cover for him to dish out more damage or that his presence also helps extend the round's duration. Similarly, when Karthus is played together with Gragas on the same team, he usually scores many fewer killing sprees than when he plays alone. This is contrasting evidence that he is worse when playing with Gragas.
Moreover, when Karthus plays with Gragas on the same side, he on average receives a little less damage than when he plays alone. Receiving not as much damage could indicate that Gragas does a decent job of protecting Karthus in teamfights.
There is no universally accepted best companion for Karthus that will always be his #1 synergy. Yet, Gragas is a terrible companion for Karthus. By playing on the same side as Karthus, he drops their win rate by -3.8% to 43.5%. This shows that there is an easy to overcome and exploit bond between Karthus and Gragas that results in them performing not as well together than without each other.
Gragas has a lower difficulty than Karthus. That means you don't need to be cautious when arranging Gragas teammates to go into battle on the same side as, as they will require a lower level of skill to play well with you.
Playing alongside, Karthus players will likely observe an overall large increase in your team’s ability to to do a lot of AP damage. Combined, these champions are able to dish out a surprising amount of magic type damage.
Conversely, by bringing Karthus and Gragas together, you will not be granting your side very much anti-tank damage dealing potential. Plan to include other champs on your team that offsets this disparity in this pairing's potential.
Regardless of your Gragas ally's skill level, you need to focus on maximizing your income, warding to avoid ambushes, and clearing objectives. If you heed this simple advice, you will do well anyway.
To truly master Karthus in order to pair well with Gragas during both the laning and mid / late game phases of League games, you should continue reading to master additional tricks and insights into this champion pairing. If you mind the build and tips shown here, you should increase your win rate significantly.
The top finished items to use in your Karthus and Gragas synergy build include Malignance, Shadowflame, and Stormsurge. When Karthus included at least these three finished items in his build, he did significantly better as an ally of Gragas than with many other typical builds. In fact, Karthus boasted an average win rate of 43.5% when synergizing his build and playstyle to Gragas with this build.
To have the highest probability of defeating your oponents, you should equip the Dark Harvest, Cheap Shot, Eyeball Collection, Ultimate Hunter, Presence of Mind, and Last Stand runes from the Domination and Precision rune sets. Of all the runes players chose for this champion pairing, this set of runes yielded the highest win rate. Moreover, these runes averaged a 43.5% winrate overall.
If you want to see Karthus with Gragas collaboration tips and stats for a an individual player tier, please choose one from the selection menu displayed above. If viewing for the first time, the stats and build suggestions displayed are calculated using every match finished with both champs.