- Win Rate
- 49.8%
- Pick Rate
- 2.1%
- Ban Rate
- 0.6%
Sion vs Illaoi
- Patch
- 26.20
- Games
- 1,574
- Lane
- All Lanes
- Tier
- All Tiers
- Last Updated
- Oct 11, 2026 UTC
- Methodology
- Data Methodology
- Author
- Dakota Chinnick
Sion vs Illaoi is a moderate matchup in LoL patch 26.20. Illaoi wins with a 52.0% win rate (+4.0%) over Sion based on 25 games. Illaoi wins the early laning phase while Sion scales better into the late game. Below you'll find the best Sion build, runes, laning stats, and strategies for the Sion vs Illaoi matchup.
Sion Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Sion performs against them. You'll get head-to-head win rates, laning stats, the best build and runes for the matchup, and early vs late game analysis — all based on real ranked data.
Who wins Sion vs Illaoi?
Sion wins 48.0% of these games. With this many games the true rate is most likely between 30.0% and 66.5% (95% range).
- Expected
- 48.8% From both champions' overall Top win rates
- Matchup effect
- −0.8 pts Observed minus expected
- Sample
- 25 games Lane: Top
- vs patch 26.19
- — Not enough games on both patches
Lane: Top · Ranked Solo/Duo & Flex · North America server · All ranks · Patch 26.20 · Oct 10
Key takeaways
- Current data slightly favors Illaoi, but the sample is too limited for a strong conclusion: Sion wins 48.0% of 25 games (95% range 30.0–66.5%).
- Both champions' overall Top win rates predict 48.8% for Sion; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Sion players pick Triumph much less often against Illaoi: 22.0% of their other Top games, under 2% here.
How we calculate this
Games: ranked Solo/Duo and Flex games on the North America server from the patch shown. Remakes (games under 5 minutes) are excluded.
A game only counts when Sion and Illaoi played the same position on opposite teams, so roaming, lane swaps within a team or a champion merely being in the same game never count as this matchup.
The 95% range is a Wilson score interval. Confidence comes from how wide that range is: within ±3 points is very high, ±5 high, ±8 moderate, anything wider low. Below 20 games a matchup is not classified at all.
Expected win rate combines both champions’ win rates in this lane (same games and filters) with the log5 formula: E = A(1−B) / (A(1−B) + B(1−A)). Matchup effect = observed − expected.
"What changes" compares Sion's choices in this matchup with the same champion's other games in the same lane, and lists a change only when it is at least 3 points and statistically significant (two-proportion z-test, |z| ≥ 2, 20+ games).
Results are not split by rank: the sample per rank is too small for honest per-rank matchup numbers.
Sion vs Illaoi Laning Stats
Only 24 games have a 15-minute snapshot so far — the lane-phase numbers appear from 30.
Whole-game averages
Sion vs Illaoi Win Rate by Game Length
Sion's win rate against Illaoi by game length. The dot is the win rate, the bar its 95% range and the dashed line the champion's usual win rate at that length. Lengths with fewer than 25 games are left blank.
No game length stands out: Sion's results against Illaoi in short and long games are within the margin of error of each other.
Sion vs Illaoi Power Spikes
Who is ahead at each stage, measured from these games. A stage reads "Even" when the difference is inside the margin of error, and "Insufficient data" when there are too few games to tell.
- Lane (15 min)Insufficient data
- First itemInsufficient data
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Sion Changes Against Illaoi
Choices Sion players make noticeably more or less often in this matchup than in their other Top games.
TriumphRuneUsually22.0%vs Illaoiunder 2%−22.0 pts
Boots of SwiftnessBootsUsually23.8%vs Illaoi44.0%+20.2 pts
Mercury's TreadsBootsUsually22.7%vs Illaoi4.0%−18.7 pts
Ability Haste (offense)Stat shardUsually3.7%vs Illaoi20.0%+16.3 pts
Adaptive Force (flex)Stat shardUsually86.9%vs Illaoi72.0%−14.9 pts
Long Sword + Refillable PotionStarting itemsUsually7.9%vs Illaoi20.0%+12.1 pts
Move Speed (flex)Stat shardUsually5.1%vs Illaoi16.0%+10.9 pts
Ultimate HunterRuneUsually1.2%vs Illaoi12.0%+10.8 pts
Best Sion Build vs Illaoi
Usual Sion build (Top)
70.6% win rate · 17 games
Against Illaoi
Not enough matchup-specific build data: only 2 of 15 Sion games against Illaoi carried a complete build, which is too few to recommend an item path from. Use Sion's standard build instead.
- Skill priority: Q > W > E — the same as usual.
Builds are ranked by the lower edge of their win rate range, not the raw win rate, so a build seen in a handful of wins never outranks a proven one.
Best Sion Runes vs Illaoi
Usual Sion runes (Top)
Grasp of the Undying
60.0% win rate · 55 games
Against Illaoi
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Sion draft in Draft Lab
Draft Lab lays out both teams lane by lane with live matchup win rates, damage profiles and game-phase lean, and suggests picks and bans from current meta data.
- Full 5v5 draft board
- Lane matchup win rates
- Pick and ban suggestions
Sion matchup data for League of Legends patch 26.20. The table below shows Sion's win rate, gold difference, and performance stats against every champion in the current meta. Click any champion name to see a detailed head-to-head breakdown including the best Sion build, runes, laning stats, and early vs late game analysis for that specific matchup.
Help us maintain accuracy! If you notice incorrect stats, missing data, or any issues, your feedback directly improves the quality of our data for the entire community.
Sion vs Illaoi FAQ - Patch 26.20
Who wins Sion vs Illaoi?
Current data slightly favors Illaoi, but the sample is too limited for a strong conclusion: Sion wins 48.0% of 25 games (95% range 30.0–66.5%).
What is Sion's win rate against Illaoi?
Sion wins 48.0% of 25 Top games against Illaoi on patch 26.20 (95% range 30.0–66.5%). Based on both champions' overall Top win rates, 48.8% would be expected.
Does Sion counter Illaoi?
Not clearly. Sion wins 48.0% of 25 games against Illaoi, and the 95% range (30.0–66.5%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Sion or Illaoi?
There are not enough games with a 15-minute snapshot yet (24) to say who wins lane.
Does Sion outscale Illaoi?
There are too few games of each length to tell yet.
When is Illaoi strongest against Sion?
On current data there is no stage of the game where Illaoi is ahead of Sion beyond the margin of error.
What should Sion build against Illaoi?
There are not enough games for a matchup-specific core, so use Sion's usual Top core: Hollow Radiance, Titanic Hydra, Heartsteel. The biggest change against Illaoi: Boots of Swiftness (23.8% usually, 44.0% here).
What runes should Sion use against Illaoi?
Use Sion's usual Grasp of the Undying page (Resolve + Inspiration); there are too few games for a matchup-specific page. The biggest change against Illaoi: Triumph (22.0% usually, under 2% here).