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.
This build might seem fairly strange, but has proved effective time and time again. It provides huge burst damage with incredible survivability. To begin, buy regrowth pendant and a health pot. Next time back we will be going for another regrowth pendant and work toward Ninja Tabi. After this we will be working on Trinity Force. To do this we start with Phage, then Sheen, and then finish it with Zeal. Once Trinity Force is complete, it is time to finish that Force of Nature we had started on. So finish that up and next is either Starks, or Spirit Visage. This depends on the other team, but eventually we want to work up to having both. Then finish off the build with some nice attack speed from Phantom Dancer. The health gain from this build is rediculous and with Irelia's passive, the attack speed bonus just makes it even more amazing. Unfortunately this character does not become a true killing machine until about level six, but after that, the other players will fear you. Alternatively you can get Tiamat at the end as well giving you some nice splash damage.