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.
Use the time after Sion has died to reposition and prepare for his return.
Even if Sion still hits a Decimating Smash, making him release the charge earlier reduces its impact.
The stats shown here emphasize some vital Lux vs. Sion counter statistics that may help you realize the differences and similarities between the two. For instance, Lux’s KDA ratio ([kills + assists] / deaths) of NaN is greater than Sion’s KDA ratio of NaN, indicating that Lux may be more central to her team's team fighting effectiveness than Sion. This observation is largely caused by the differences in assists.
Lux typically has a similar longest kill spree as her matchup does. On average, she receives less damage than Sion. This is usually reflective of different amounts of tankyness, but it can also indicate that the champion with higher HP has less mobility and thus is not able to flee from further harm when poked or engaged.
Both League of Legends champions are great. Both have their pros and cons. In League's current meta, Lux usually loses when trying to fight Sion, with a 48.8% win rate. As a result, Lux makes a bad counter for Sion.
While Lux does have a lower winrate than Sion, when on opposite teams, Lux also has a greater level of difficulty that makes her a more time consuming champ to develop with. You still need to be cautious when picking Lux into Sion.
Moreover, Lux also has a good amount of CC and other utility, a similar amount to Sion. This often makes her just as valuable during teamfights, especially when fighting champions with a ton of burst damage.
While there is not a single best champion overall in League of Legends, in Lux vs Sion matchups, Sion is the better champ with a lower win rate, similar champion depth, and a similar amount of utility to help out your allies during late stage team fights.
Lux is a somewhat poor counter to Sion. Focus your gameplay on maximizing your gold income and clearing objectives. If you do that, you should be able to stand on your own as Lux against Sion.
To truly master Lux to counter Sion during both the early game and mid / late game phases of League of Legends, you should keep reading to pick up a few extra lessons on this matchup. If you mind the build and tips presented here, you will increase your win rate significantly and be closer to League of Legends pro players.
Lux typically racks up less CS relative to Sion. Champs who on average don't earn much CS often don't require much CS to be valuable teammates, such as supports. They are able to scale properly off of their abilities and first items alone. Yet, champs with a lot of CS, such as hyper-carries, often need a lot of items to be effective. In either situation, try to do better than the values displayed on this page to do well.
The best items to have in your Lux versus Sion build include Cryptbloom, Zaz'Zak's Realmspike, and Luden's Companion. When Lux bought at least these three pieces in her build, she did a lot better vs. Sion than with many other commonly used item sets. In fact, Lux had an average winrate of 48.8% when countering Sion with this counter build.
To have the highest likelihood of defeating Sion as Lux, Lux players should equip the First Strike, Magical Footwear, Biscuit Delivery, Cosmic Insight, Absolute Focus, and Gathering Storm runes from the Inspiration and Sorcery rune sets. Out of all the runes players chose for Lux vs Sion clashes, this composite of runes resulted in the best win rate. In fact, these runes averaged a 48.8% winrate overall.
By default, tips, statistics, and builds on how to beat Sion as Lux are given for all skill levels combined. To narrow the stats and builds to a particular division, you can use the selection menu located earlier in the counter matchup guide.