A Korean Challenger with 2.6M mastery on Irelia alone, broken down by the data. Turns out banning Renekton is the right call?!

A Korean Challenger named Aileri. Almost every ranked game is Irelia. The mastery sits at 2.6M points, roughly seven times the next champion, so the commitment is not in doubt. I pulled his recent games to see what that kind of tunnel vision actually looks like.

• Aileri#KR1, an Irelia-only one-trick
• 2.6M mastery, 270-221 this season for a 55% win rate
• Currently Challenger at 2508 LP

First, what is Irelia

Most players know her, but here is the short version for everyone else (I am a noob and did not even realise W was a charged attack, I just thought it looked swirly).

Champion	Type	What she does
Irelia, the Blade Dancer	Fighter-leaning assassin, mana	Dashes around on Q resets

Ability text pulled from the game data.

	Ability	Effect
	Passive, Ionian Fervor	Landing abilities builds stacks and attack speed. At max, basic attacks deal bonus damage
	Q, Bladesurge	Dash and strike, healing herself. Resets if it kills or hits a marked target
	W, Defiant Dance	A charged strike. Longer charge means more damage, and physical damage taken drops while charging
	E, Flawless Duet	Two blades converge to stun and mark. The combo starter
	R, Vanguard's Edge	Throws a wall of blades that marks enemies

Stun with E, then chain Q to melt them. Marks and kills keep Q coming back, and that is the fun of her. Skill order is E at level 1, then Q first, W second, E last. Reset damage goes up first. That is enough to read Aileri's games.

What moves between wins and losses

Across 40 games he is 21-19, a 52% win rate. Here is what changed between the wins and the losses.

Losing games add nearly two more deaths. Kills, CS and damage sink with them. Less a flashy misplay, more a game where she died and never got going. Figures.

The interesting part is kill participation. It stays around 46% whether he wins or loses. How much she joined the fights barely moved the result. Game length is the same 25.6 minutes too, so nothing dragged out.

Whether Aileri wins comes down to staying alive and farming, not how much she groups. Irelia's whole character shows up in the numbers. Carry or feed.

Some matchups just lose

The lane matchups are blunt.

0-4 into Renekton. The old line about Irelia losing the early brawl to Renekton, confirmed by a 2.6M-point one-trick. Rumble goes 2-0 without trouble. Maybe skill does not erase matchups after all. Ban it, or if you cannot, switch to a plan that limits the bleeding.

Runes, summoners and boots shift by matchup

Fix the core, tune the edges. That is where Aileri is sharp.

The keystone is Conqueror across all 40 games. Stacking it by trading is Irelia's lifeblood, so it never moves.

Summoners change with the opponent's type.

Summoners	Common opponents	Idea
Flash + Teleport	K'Sante, Aurora, Lissandra	Scaling or ranged lanes. Do not force it, hold tempo with TP
Flash + Ignite	Renekton, Rumble, Vladimir	Go for the early kill. Grievous wounds also bites Vladimir
Flash + Exhaust	Xin Zhao, Fizz	Surviving dives and burst

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

Boots	Opponent	Recent
Plated Steelcaps	AD lanes	10 games
Immortal Path	AP and ranged lanes	5 games

Steelcaps into AD, Immortal Path into everything else. A clean split. Steelcaps tanks the AD lane. Against AP, armor is dead weight, so she takes Immortal Path and wins the long fight on omnivamp instead. Note it is not magic resist (I thought it was Mercury's at first too). Copy just this and your laning steadies.

Build

Item	When	Note
Blade of the Ruined King	First item every game, all 15	Irelia's partner. Sustained damage and tank shredding
Hullbreaker	AD lanes and split	Takes a side lane alone
Kraken Slayer, Wit's End	AP lanes	Keeps damage up and adds magic resist
Death's Dance, Guardian Angel	When she grinds it out	Harder to kill, revive insurance

What to steal from an OTP

• Stay alive first. Across 40 games, deaths moved the result most. Irelia wins by surviving and farming more than by showing up to every fight
• Accept the bad matchups. Even the master goes 0-4 into Renekton. Unwinnable lanes are about shrinking the loss with summoners and timing. Swallow your pride and ban it
• Separate the fixed from the flexible. Conqueror, Q first and a first-item BotRK stay put. Only summoners, boots and later items move

How far can one champion take you, and who can you still not beat. Both show up in the numbers. Next time, another server and another champion.

Sourced from the Riot Games API. Analysis based on a public player's match data.