- Win Rate
- 50.7%
- Pick Rate
- 2.3%
- Ban Rate
- 13.5%
Illaoi vs Sion
- Patch
- 26.20
- Games
- 3,011
- Lane
- All Lanes
- Tier
- All Tiers
- Last Updated
- Oct 12, 2026 UTC
- Methodology
- Data Methodology
- Author
- Dakota Chinnick
Illaoi vs Sion is a decisive matchup in LoL patch 26.20. Illaoi wins with a 58.1% win rate (+16.3%) over Sion based on 43 games. Illaoi wins the early laning phase while Sion scales better into the late game. Below you'll find the best Illaoi build, runes, laning stats, and strategies for the Illaoi vs Sion matchup.
Illaoi Matchup Breakdown
Use the dropdown to select an opponent and see a detailed breakdown of how Illaoi 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 Illaoi vs Sion?
Illaoi wins 58.1% of these games. With this many games the true rate is most likely between 43.3% and 71.6% (95% range).
- Expected
- 51.2% From both champions' overall Top win rates
- Matchup effect
- +6.9 pts Observed minus expected
- Sample
- 43 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 – Oct 11
Key takeaways
- Current data slightly favors Illaoi, but the sample is too limited for a strong conclusion: Illaoi wins 58.1% of 43 games (95% range 43.3–71.6%).
- Both champions' overall Top win rates predict 51.2% for Illaoi; the result is within the margin of error of that, so this matchup mostly reflects the two champions' general strength.
- Illaoi usually wins the lane: 498 gold ahead of Sion at 15 minutes on average (42 games with a 15-minute snapshot).
- Illaoi players pick Black Cleaver far more often against Sion: 76.4% of their other Top games, 97.7% 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 Illaoi and Sion 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 Illaoi'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.
Illaoi vs Sion Laning Stats
At 15 minutes
Whole-game averages
Illaoi vs Sion Win Rate by Game Length
Illaoi's win rate against Sion 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: Illaoi's results against Sion in short and long games are within the margin of error of each other.
Illaoi vs Sion 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)IllaoiIllaoi gold at 15: +498
- First itemIllaoiIllaoi: 11.8 min · Sion: 12.9 min
- Games under 20 minInsufficient data
- 20–30 min gamesInsufficient data
- 30+ min gamesInsufficient data
What Illaoi Changes Against Sion
Choices Illaoi players make noticeably more or less often in this matchup than in their other Top games.
Black CleaverItemUsually76.4%vs Sion97.7%+21.3 pts59.5% WR here
ConditioningRuneUsually2.1%vs Sion7.0%+4.9 pts
Best Illaoi Build vs Sion
Usual Illaoi build (Top)
79.6% win rate · 49 games
Against Sion
Not enough matchup-specific build data: only 4 of 23 Illaoi games against Sion carried a complete build, which is too few to recommend an item path from. Use Illaoi's standard build instead.
- Illaoi usually completes Black Cleaver first, at 11.8 min (median of 32 games).
- Sion usually completes Heartsteel first, at 12.9 min (median of 23 games).
- Skill priority: E > Q > W — 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 Illaoi Runes vs Sion
Usual Illaoi runes (Top)
Grasp of the Undying
55.0% win rate · 327 games
Against Sion
Too few games for a matchup-specific rune page yet — use the usual page.
Plan your Illaoi 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
Illaoi matchup data for League of Legends patch 26.20. The table below shows Illaoi'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 Illaoi build, runes, laning stats, and early vs late game analysis for that specific matchup.
Other Illaoi Matchups
Hardest for Illaoi
Easiest for Illaoi
Win rate and games for each matchup. Lists are ranked by the edge of the 95% range so small samples cannot top them; matchups with at least 50 games only.
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.
Illaoi vs Sion FAQ - Patch 26.20
Who wins Illaoi vs Sion?
Current data slightly favors Illaoi, but the sample is too limited for a strong conclusion: Illaoi wins 58.1% of 43 games (95% range 43.3–71.6%).
What is Illaoi's win rate against Sion?
Illaoi wins 58.1% of 43 Top games against Sion on patch 26.20 (95% range 43.3–71.6%). Based on both champions' overall Top win rates, 51.2% would be expected.
Does Illaoi counter Sion?
Not clearly. Illaoi wins 58.1% of 43 games against Sion, and the 95% range (43.3–71.6%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Illaoi or Sion?
Illaoi usually wins the lane: 498 gold ahead of Sion at 15 minutes on average (42 games with a 15-minute snapshot).
Does Illaoi outscale Sion?
There are too few games of each length to tell yet.
When is Sion strongest against Illaoi?
On current data there is no stage of the game where Sion is ahead of Illaoi beyond the margin of error.
What should Illaoi build against Sion?
There are not enough games for a matchup-specific core, so use Illaoi's usual Top core: Black Cleaver, Spirit Visage, Sterak's Gage. The biggest change against Sion: Black Cleaver (76.4% usually, 97.7% here).
What runes should Illaoi use against Sion?
Use Illaoi's usual Grasp of the Undying page (Resolve + Precision); there are too few games for a matchup-specific page. The biggest change against Sion: Conditioning (2.1% usually, 7.0% here).