Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
.: First build on mobafire for me :.
This is what i go with when i play Irelia, i almost ALWAYS have like over 20 kills and like 4 deaths not more.
At start buy a DORANS BLADE and some consumable like HP pot or something. Play defensivly , farm minions untill lvl 6, then recall as soon as you can afford merc threads. Start ganking some, use your ulti to farm and heal on minions. Aim for players that has more % of hp then you , this way you can stun them and easly get a kill on them, Irelia is a great nuker, people underestimate her alot. Keep spamming E and Q and you will get kills 100%.
I figured out phantom dancer is a great item for Irelia, gives you aspeed and movement speed for ganks, so with crit rating aswell wich comes handy for infitys edge later on. After you got phantom dancer go for a phage and upgrade it to trinity force, it gives u alot of advantage in fights. Keep ganking and farming minions, also remember to let tanks etc engage before you as your preatty weak when it comes to engaging. When your VS tanks remember that W will always come in handy with its true dmg.
After trinty force, i like to get a guardian angel, makes you able to be more agressive, engage some teambattles and gives you an advantage in ganking(tower diving etc.)
After guardian just go for an infitys edge, and you will be pwning lanes all the way to the top.
After you got all items, you can sell your dorans blade and buy whatever comes in handy, vs high dmg melee (thornmail etc..) or just magic res or more DMG.
I recommend a Bloodthirster in the Dorans slot, as it gives u DMG plus lifesteal...
This was my build, feel free to comment etc, sorry if i made it "fast" but this is first time i dont know all functions on this website yet.