Defiant Dance is not interrupted by crowd control, try timing it for incoming disables.
Flawless Duet does not have a maximum travel distance, try using it in creative ways.
Use Bladesurge to cover great distances by targeting low life minions on your way to champion targets.
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 stat comparisons shown on this page clarify some valuable Irelia versus Sion matchup stats that may help you distinguish the distinctions between this set of champs. As an example, Irelia’s KDA ratio ([kills + assists] / deaths) of NaN is more than Sion’s ratio of NaN, indicating that Irelia may be more central to her team's team fighting capability than Sion. This observation is in large part fueled by the difference in kills.
Irelia often has a much larger longest killing spree than her foe does. Typically, she receives less damage than Sion. This typically indicates different amounts of tankyness, but it can also show that the champion with increased HP has less agility and thus is not able to flee from additional damage when poked or engaged.
Both League of Legends champs are great champions. Both champs have their strengths, weaknesses, and counters. In League's current meta, Irelia usually fairs equally well when facing off against Sion, with a 49.3% win rate. As a result, Irelia makes an ok counter for Sion.
While Irelia does have a lower win rate compared to Sion, when they face off with one another, Irelia also has a greater difficulty level that makes her a more complex champion to pick up and master. You still need to be cautious when picking Irelia into Sion.
Furthermore, Irelia has some amount of utility and CC, a similar amount to Sion. This makes her just as valuable during team fights, especially when facing champions with a ton of burst damage.
While there isn't one best champion overall in League of Legends, in Irelia vs Sion matchups, Sion is the better champion with a similar win rate, similar champion depth, and a similar amount of utility to help out your allies during late stage team fights.
Irelia is a somewhat poor counter to Sion. Make sure you focus your actions on increasing your gold and cs and clearing objectives. If you can do that, you should be able to stand on your own as Irelia against Sion.
To truly master Irelia in order to counter Sion during both the laning 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 listen to the build and suggestions shown here, you will increase your win rate by a lot and be that much closer to League of Legends pro players.
Irelia often gets a similar amount of CS compared to Sion. Champions who typically don't take much CS often don't have to have much CS to be effective, such as support champions. These kinds of champions are able to scale properly off of their skills, stats, and first items alone. Yet, champs with large amounts of CS, such as hyper-carries, often need a lot of items to be effective. In either case, try to do better than the values displayed here to do well.
The best items to have in your Irelia versus Sion build include Blade of The Ruined King, Terminus, and Death's Dance. When Irelia included at least these three pieces in her build, she did a lot better versus Sion than with most other common item sets. In fact, Irelia boasted an average win rate of 49.3% when playing against Sion with this build.
To have the greatest chance of beating Sion as Irelia, Irelia players should take the Conqueror, Triumph, Legend: Alacrity, Last Stand, Biscuit Delivery, and Cosmic Insight runes from the Precision and Inspiration rune sets. Out of all the runes players picked for Irelia vs Sion LoL games, this combination of runes yielded the best win rate. Notably, these runes gave a 49.3% win rate overall.
By default, tips, stats, and builds on how to beat Sion as Irelia are given for all ranked divisions. If you would like to scope the stats and builds to an individual rank, you can use the selection menu earlier in the counter matchup guide.