in this build the items are built around mobility and power but is only useful if you have the ability to farm in top lane.if your farm is cut off you lose most of you chances to do anything in game. you need to farm early and mid game as irelia to snow ball late game. you need the initial phage before you build triforce you get phage then sheen then finish you triforce if having early game trouble get wriggles first and then triforce

with irelia top there is a lack of cons and alot of pros. her strength comes from her tankyness and mobilitie, irelia is extremely good at 1v1s especially if she has lower health then her opponent and she is very strong all game and is one of those champs that either dominates or get wrecked this build makes her very tanky-mobile and strong she has very good early sustain in top lane and can counter alot of champions in the top lane but is indanger of getting early ganked because she has no escapes.

irelia is strong and has the ability to get a lot of early game kills in lane and from ganking. that is why you start with your q so that you may farm and get that extra damage and use to avoid skill shots and such. you get your e second so that you may move in for kills when your low health and get an advantage. her hiten style is strong and the true damage and healing from it is the most useful spell in her arsenal and makes her very strong and good at getting kills.

farming with irelia is particularly easy you just last hit with her q. also you may want to use her ult in lane to farm considering its relatively low cool down, but that isnt all. activating hiten style is also another great way to farm it is easy and clears minions fast so if you have it up and you dont plan on doing any team fights soon then this would be a wise decision. how ever your ultimate is also a very strong sustain spell in a team fight so if you dont know if your going to be in a team fight soon or not but save it just in case