- Win Rate
- 49.8%
- Pick Rate
- 2.0%
- Ban Rate
- 0.6%
Sion vs Illaoi
- Patch
- 26.20
- Games
- 2,574
- Lane
- All Lanes
- Tier
- All Tiers
- Last Updated
- Oct 11, 2026 UTC
- Methodology
- Data Methodology
- Author
- Dakota Chinnick
Sion vs Illaoi 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 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 41.9% of these games. With this many games the true rate is most likely between 28.4% and 56.7% (95% range).
- Expected
- 48.8% 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: Sion wins 41.9% of 43 games (95% range 28.4–56.7%).
- 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.
- Illaoi usually wins the lane: 498 gold ahead of Sion at 15 minutes on average (42 games with a 15-minute snapshot).
- Sion players pick Doran's Shield + Health Potion + Stealth Ward much less often against Illaoi: 21.0% of their other Top games, 7.0% 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
At 15 minutes
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)IllaoiSion gold at 15: −498
- First itemIllaoiSion: 12.9 min · Illaoi: 11.8 min
- 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.
Doran's Shield + Health Potion + Stealth WardStarting itemsUsually21.0%vs Illaoi7.0%−14.0 pts
Mercury's TreadsBootsUsually23.3%vs Illaoi9.3%−13.9 pts
Attack Speed (offense)Stat shardUsually88.5%vs Illaoi76.7%−11.7 pts45.5% WR here
Ability Haste (offense)Stat shardUsually3.7%vs Illaoi14.0%+10.3 pts
Move Speed (flex)Stat shardUsually4.6%vs Illaoi11.6%+7.0 pts
Teleport + IgniteSummoner spellsUsually0.7%vs Illaoi7.0%+6.2 pts
Presence of MindRuneUsually0.9%vs Illaoi7.0%+6.1 pts
Ultimate HunterRuneUsually1.0%vs Illaoi7.0%+5.9 pts
Best Sion Build vs Illaoi
Usual Sion build (Top)
67.7% win rate · 31 games
Against Illaoi
Not enough matchup-specific build data: only 3 of 20 Sion games against Illaoi carried a complete build, which is too few to recommend an item path from. Use Sion's standard build instead.
- Sion usually completes Heartsteel first, at 12.9 min (median of 23 games).
- Illaoi usually completes Black Cleaver first, at 11.8 min (median of 32 games).
- 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
57.6% win rate · 99 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.
Other Sion Matchups
Hardest for Sion
Easiest for Sion
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.
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 41.9% of 43 games (95% range 28.4–56.7%).
What is Sion's win rate against Illaoi?
Sion wins 41.9% of 43 Top games against Illaoi on patch 26.20 (95% range 28.4–56.7%). Based on both champions' overall Top win rates, 48.8% would be expected.
Does Sion counter Illaoi?
Not clearly. Sion wins 41.9% of 43 games against Illaoi, and the 95% range (28.4–56.7%) includes 50%, so neither champion reliably counters the other on current data.
Who wins lane, Sion or Illaoi?
Illaoi usually wins the lane: 498 gold ahead of Sion at 15 minutes on average (42 games with a 15-minute snapshot).
Does Sion outscale Illaoi?
There are too few games of each length to tell yet.
When is Illaoi strongest against Sion?
Illaoi is measurably ahead in: Lane (15 min), First item.
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: Doran's Shield + Health Potion + Stealth Ward (21.0% usually, 7.0% 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: Attack Speed (offense) (88.5% usually, 76.7% here).