Hello , Im a baws , and here is a guide for competitive Irelia.

ARPEN red like any ad carry , dodge yellows, MR/lvl blue cause you will get lvls quick in top lane , and 2 arpen quint 1 MS quint cause MS is so op on irelia.

The reason I put only trinity in the build , is cause u can build WHATEVER U WANT after trinity force. team needs CC ? get frozen mallet . team still needs CC and enemy team is AD? get randuins. viable picks on irelia are:
Force of Nature , Spirit Visage , Guardians Angel , Randiums Omen , Frozen Heart , Quicksilver sash , Wits End, Banshees , Aegis , Atmogs , Hexdrinker.

FARM , FARM , FARM ! Irelia would not get her full potential if she is not farmed , and even if you fight your laning opponent and you die before you get trinity , thanks to your farm you will get da trinity and kill him like a baws.Yes , usually after they kill u once they will win in lane , but with irelia , its very different .Use your Q to get the last hits if need , use your ulti for pushing or huge creep wave , and just FARM !

Bye.