If you have trouble landing Prismatic Barrier, remember that it returns to you after it reaches max range. Try positioning yourself to hit your allies with its return trip.
Lux has great zone control abilities. Try to set up Lucent Singularity to prevent an enemy's advance or escape.
Lucent Singularity is a great scouting tool. Try throwing it into brush before walking into it to check for ambushes.
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.
The Lux Karthus synergy stats shown here demonstrate the areas of her gameplay that do better (or worse) when paired with Karthus, compared to her overall stats. Significant differences are areas of focus that highlight how her gameplay changes when paired with this other champion.
Overall, Lux sees a very large drop in her KDA (ratio of kills and assists to deaths) when paired with Karthus. His KDA decreased from NaN to NaN. This drop shows that Karthus helps Lux perform poorer in ranked LoL rounds. Yet, the small difference proves that this performance change is not very impactful.
When Lux tries to synergize with Karthus, she gets a barely noticable drop in her full damage dealt. This difference may indicate that Karthus does not help cover for her to deal more damage or that his presence also helps increase the match's duration. Similarly, when Lux is played alongside Karthus on the same team, he usually scores many fewer killing sprees than when she plays without Karthus. This is contrasting evidence that she is worse when playing alongside Karthus.
Moreover, when Lux plays with Karthus on the same side, she on average takes more damage than when she plays alone. Getting dealt more damage could indicate that Karthus does a poor job of protecting Lux in teamfights.
There is no one best champion pairing for Lux that will no matter what be her top ally. Yet, overall, Karthus is a terrible teammate for Lux. By being on the same team as Lux, he lowers their win rate by -3.5% to 46.3%. This signals that there is a very bad bond between Lux and Karthus that allows them to perform worse together than alone.
Karthus has a greater difficulty than Lux. That means you need to be very careful when arranging Karthus teammates to fight alongside, as they will require a greater level of skill to work well with you.
When playing on the same side, Lux players should expect to see an overall large increase in your team’s ability to deal magical damage. Together, these champs are able to dish out a surprising amount of magic type damage.
Although, by bringing Lux and Karthus together, you will not be granting your side enough anti-tank damage dealing potential. We recommend you have other champs on your team that fills this relative disparity in this pairing's playstyle.
Regardless of your Karthus ally's ability, you should focus on maximizing your income, outlasting your enemies, and taking down objectives. If you heed this simple advice, you will do well, regardless.
If you would like to truly master Lux in order to synergize with Karthus during both the early game and mid / late game phases of League of Legends, you should keep reading to learn a few extra tricks and insights into this champion pairing. If you use the build and tips presented here, you will increase your win rate by a lot.
The top items to build first in your Lux and Karthus synergy build include Rabadon's Deathcap, Zaz'Zak's Realmspike, and Stormsurge. When Lux combined at least these three pieces in her build, she did significantly better when fighting alongside Karthus than with most other typical builds. In fact, Lux had an average win rate of 46.3% when synergizing her build and playstyle to Karthus with this build.
To have the highest likelihood of vanquishing your oponents, you should take the Arcane Comet, Manaflow Band, Transcendence, Scorch, Cheap Shot, and Ultimate Hunter runes from the Sorcery and Domination rune sets. Of all the rune sets we have analyed for this champion pairing, this combination of runes resulted in the highest win rate. In fact, these runes gave a 46.3% win rate overall.
By default, tips, stats, and builds on how to synergize Karthus with Lux are presented for all skill levels, merged. If you want to narrow the stats and builds to a distinct skill level, you may use the selection menu located earlier in the counter matchup guide.