A Korean-server challenger with 2.64M points on Irelia alone — analyzing Aileri#KR1's data. Turns out banning Renekton was the right call!?

A Korean-server challenger, Aileri#KR1. Almost every ranked game is Irelia. Mastery sits at 2.64 million points — roughly seven times the player with the next-highest mastery, which tells you just how deep this goes. We wanted to see what a record this singularly focused actually reveals, so we analyzed the recent games from the data.

• Aileri#KR1#KR1, an Irelia one-trick
• 2.64M mastery, 270-221 this season for a 55% win rate
• Currently at Challenger, 2508 LP

What kind of champion is Irelia?

Any LoL player already knows her, but here's a quick rundown for anyone who doesn't (I'm a noob myself and didn't know W was a charged attack — I just thought "huh, something's swirling").

Champion	Type	Signature trait
Irelia, the Blade Dancer	A fighter-leaning assassin, mana user	Bounces between enemies using Q's reset

Ability rundown

	Ability	Effect
	Passive: Ionian Fervor	Landing abilities builds stacks that raise attack speed. At max stacks, basic attacks deal bonus damage
	Q: Bladesurge	Dashes and slashes, healing herself. The cooldown resets on a kill or against a marked target
	W: Defiant Dance	Charges up before slashing. The longer the charge, the more damage, and physical damage is reduced while charging
	E: Flawless Duet	Two blades pin the target for a stun and apply a mark. Her combo starter
	R: Vanguard's Edge	Fires a mass of blades to spread marks and creates a wall of blades

Stun with E, then chain Q repeatedly to melt the target. The way marks and kills keep Q from running out is where the champion's charm lives. Skill order is E only at level 1, then Q maxed first, W second, E last — prioritizing the damage on her reset. With that covered, you're set to read Aileri#KR1's games properly.

The data from wins and losses

The last 40 games sit at 21-19, a 52% win rate. Let's check what changes between wins and losses.

In losses, deaths run 1.5x higher. Kills, CS and damage dealt all drop together. This isn't a flashy play gone wrong so much as simply dying and failing to scale — which, fair enough.

What's interesting is kill participation. It sits at around 46% regardless of win or loss. How much she got involved in her team's fights barely swung the outcome either way. Game length is also nearly identical at 25.6 minutes for both — it's not that games dragged on and fell apart.

Whether Aileri#KR1 wins or loses comes down not to how much she gets involved with her team, but to whether she herself survives and scales. Irelia's character as a champion shows up directly in the numbers. Carry or feed.

Some matchups just don't go her way

Win rates by matchup were even clearer.

Four straight losses to Renekton. The old wisdom that Irelia loses the early trading war against him got played out exactly as expected, even by a 2.64M-mastery expert. Against Rumble, two clean wins with no drama. In the end, it seems even world-class skill doesn't erase a bad matchup. It might make sense to just ban him outright, or, without a ban slot available, switch to a playstyle that limits the damage.

Runes, summoner spells and boots shift by matchup

Fix the core, tweak the details — that's where Aileri#KR1's skill shows.

The keystone is Conqueror, fixed across all 40 games. It's the lifeline of an Irelia who keeps stacking damage through sustained attacks, so this never moves.

Summoner spells swap based on the opponent's type.

Summoner spells	Main opponents	Purpose
Flash and Teleport	K'Sante, Aurora, Lissandra	Scaling or ranged matchups. Keep tempo via Teleport instead of forcing it
Flash and Ignite	Renekton, Rumble, Vladimir	Goes for an early kill. Also useful against Vladimir to shut down his healing
Flash and Exhaust	Xin Zhao, Fizz	For surviving dive or burst-heavy opponents

Boots are even simpler, switched almost mechanically by the opponent's damage type.

Boots	Opponent	Recent games
Plated Steelcaps	AD matchups	10 games
Immortal Path	AP / ranged matchups	5 games

Plated against AD, Immortal Path against everything else. A clean split. Against AD opponents, armor makes her stronger in trades. Against AP opponents, armor does little, so instead she picks up sustain in extended fights via Immortal Path's omnivamp. Note it's not magic resist boots (I assumed Mercury's Treads myself at first). Copying just this one binary choice already makes a real difference to early-game stability.

Build

Item	When	Note
Blade of the Ruined King	First item, every single time across all 15 tracked games	Irelia's best friend. Sustained damage and shredding tanks
Hullbreaker	Against AD or when splitting	Solo-splits a side lane
Kraken Slayer, Wit's End	Against AP	Keeps the damage flowing while adding magic resist
Death's Dance, Guardian Angel	When she wants to stay in the fight	Harder to kill, with a comeback insurance policy

What to take from this OTP

• Above all, don't die. Across 40 games, deaths moved the win/loss needle more than anything else. For Irelia, it seems staying alive and farming solidly gets her closer to a win than jumping into every fight
• Accept the bad matchups. Even an expert goes 0-4 against Renekton. For a matchup this lopsided, it's realistic to lean on your summoner spells and know when to disengage to keep the loss small. Swallow your pride and ban him if you have to!
• Separate what stays fixed from what changes. Conqueror, Q-first leveling, and opening with Blade of the Ruined King never move. What changes is only the summoner spells, boots, and everything after the first item

Both how far mastery can take you, and which opponents you still can't beat even at the top — the numbers showed both sides.

Next time, a different server and a different champion — digging for another path to victory.

Source: the Riot Games API. Analysis based on an individual player's public match data.