Killing Tentacles whenever possible will make it much easier to win a fight against Illaoi.
When your spirit gets pulled out, fight back if you can. Dealing damage to Illaoi reduces the spirit's duration.
Avoid grouping up for Leap of Faith to reduce the number of Tentacles available to Illaoi.
The stat comparisons provided here clarify several significant Sett vs. Illaoi counter stats that may help you appreciate the differences between these two champs. For instance, Sett’s KDA ratio ([kills + assists] / deaths) of NaN is better than Illaoi’s KDA ratio of NaN, showing that Sett may be more central to his team's team fighting effectiveness than Illaoi..
Sett typically has a similar longest killing spree as his opponent does. Commonly, he receives a similar amount of damage to Illaoi. This often reflects different amounts of tankyness, but it can also show that the champ with more health has less mobility and thus is not able to escape additional harm when poked or engaged.
Both LoL champs are great. Both champs have their strengths, weaknesses, and counters. In the game's current meta, Sett usually loses when trying to fight Illaoi, with a 46.6% win rate. Therefore, Sett makes a poor counter for Illaoi.
While Sett does have a lower win rate compared to Illaoi, when on opposite teams, Sett also has a lower learning curve that makes him a less challenging character to learn and master. You should expect to face a difficult match when picking Sett into Illaoi.
Moreover, Sett also has only a small amount of CC and other utility, a similar amount to Illaoi. This often makes her just as valuable during teamfights, especially when facing champions with a ton of burst damage.
While there is not a single best champion in League of Legends, in Sett vs Illaoi matchups, Illaoi is the better champion with a much lower win rate, less champion complexity, and a similar amount of utility to help out your teammates during late stage team fights.
Sett is a garbage counter for Illaoi. Make sure you focus your actions on increasing your CS and clearing objectives. If you are able to do that, you should hold your own as Sett against Illaoi.
To truly master Sett to counter Illaoi during both the early game and mid / late game phases of League of Legends, you should continue reading to pick up a few extra lessons on this matchup. If you mind the build and stats shown above, you will grow your win rate by a lot and be closer to League of Legends pro players.
Sett usually gets a similar amount of CS relative to Illaoi. Champions who typically don't take much CS often don't need much CS to be effective, such as supports. They are able to scale well off of their skills, stats, and first items alone. Yet, champs with a lot of CS, such as hyper-carries, typically need many items to be effective. In either case, try to do better than the values shown here to do well.
The most important items to prioritize in your Sett versus Illaoi build include Goredrinker, Sterak's Gage, and Titanic Hydra. When Sett combined at least these three items in his build, he performed significantly better countering Illaoi than with many other commonly used item sets. In fact, Sett had an average win rate of 46.6% when countering Illaoi with this counter build.
To have the highest probability of coming out on top against Illaoi as Sett, you should equip the Conqueror, Triumph, Legend: Alacrity, Last Stand, Bone Plating, and Unflinching runes from the Precision and Resolve rune sets. Out of all the rune combinations players used for Sett vs Illaoi counter picks, this combo of runes yielded the greatest win rate. In fact, these runes averaged a 46.6% win rate overall.
By default, tips, statistics, and builds on how to beat Illaoi as Sett are given for every ranked division. To filter the stats and builds to an individual player tier, you may use the selection menu earlier in the counter matchup guide.