The build is pretty explanatory, short and simple so enjoy. Lee Sin is a high damage character who needs lots of atk dmg. This build should give u a viable build for taking out tanks and an ap ****.

Buy all the items in sequence when u get to the second phantom dancer you sell your beserker's greaves then sell your dorans blade and get an infinities edge. The reason for this because the phantom dancers should provide u with enough movement speed and the infinities edge will give u enough damage to get a penta-kill.

For lee sin i get flash and ignite. You can exchange flash for exhaust if u want to be a first blood bandit. I some times do this cause when ur Lee Sin the blind monk you usually a team carry. Exhaust can also help u when ur on low hp vsing a master yi so you dont take dmg and can get that extra kill.

Pros high damage output
Cons thornmail can be troubble