Lee Sin Build
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.
Well, this is my build I figured out after a few times playing him. This is a great build and I did well every time using this amazing build.
I tried building all DPS, but I was too squishy. That is where the Force of Nature comes into play. Kill as many as minions as you can as soon as you get it. You won't die that often either, it is very useful for lee sin as he is squishy. All the items basically are DPS except for the Force of Nature, since all of his attacks are physical.
I chose flash for escaping situations when multiple enemies are attacking you. It is a good get away spell, and also to flash and combo with the ulti.
And for ignite, it is to finish off low hp characters since Lee Sin doesn't have a very powerful stun.