Hello this is a guide for lee sin and ill show you how to make him do miracles.You will have a great time with the blind monk and his gameplay is very nice i hope you like my built and have fun with lee sin.

Pros

-Great Farmer
-Perfect jungler
-high damage
-Good lane even against ranged enemies
-Chaser(nothing escapes from him)

Cons

-Low health
-Complicated gameplay
-hard getting used to

The standard build i give is very good for general fights and he is kinda over powered with it.Of course there will be special cases that you might need to change a few things for a defense item or penetration(either armor or magic resist)

Ok first taking sonic wave for harassing as you use it and then reasoning strike you spam it couple times and then go for the real thing and of course you maximize this skill first(1,4,5,7,9)then you pick tempest for the secondary damage ability and cripple which will slow your enemies and reduce their attack speed for 1vs1 fights maximize this skill second(2,8,10,12,13)and last is Safeguard which will shield you and activating iron will make you stay on a fight much longer also if you are surrounded by many minions combine Iron Will with Tempest and you will get a large amount of health maximize this skill last(3,14,15,17,18).Your ultimate ability is very useful Dragon's rage deals a good amount of damage and knocks back the enemy try casting it while you face your side of the lane to knock enemies far away from their turrents which means their safety.Cast safeguard to allies whenever you need to escape from enemies and in battles remember to use your skills often but dont overdo it just remember to refresh your passive.

21/0/9 is most helpful i would say i haven't discovered yet another masteries build that might help but if you would like a very tiny change maximize CDR on Offence make it 22/0/8

I use Ghost and Exhaust most times but trying replace 1 of them with ignite could make a big difference in your gameplay i would not suggest heal as you get a good amount of lifesteal with 2xBloodthirsers and iron will.Of course not to clarity because you dont have mana pool and i dont think flash might be a good use for lee sin as he can escape with safeguard on allies and use sonic wave/reasoning strike to execute an enemy.Use smite for jugling as always or use it for taking down creeps easy on 3vs3 early game.

For Jungling you have to change your skill sequence.first obtain tempest and maximize as fast as possible(1,4,5,7,9)then share Sa***uard points with sonic wave and of course put point to ultimate as much as you can.instead of taking youmuu's Ghostblade try obtain madreds bloodrazors as fast as possible and of course the first item you have to take is Madred's razors which is the best item for junglers

This runes are the most helpful i believe as you need the penetration as most melee characters do,dodge seals might be helpful on a fight but you can always try critical strike,i strongly suggest CDR(Cooldown reduction)because you need it ingame for spamming skills and harassing and of course quintessences of armor penetration as marks.

Lee sin is an enjoyable killing machine which can hold a lane or jungle his gameplay is kinda confusing but can get ready interesting and fun.Using his skill in perfect timing will be deadly