Lesley need some movement speed, also need critical damage and attack speed-physical damage. We can buy that items but don’t forget you are Marksman you should get nice position when doing teamfight. Let’s look close this items, of course you can comment your idea about Lesley Attack Damage Build.
Lesley Hard Crit And Damage Build (Perfect)
Firstly: Swift Boots

+15% Attack Speed
Unique: +40 Movement Speed
Then: Windtalker

+25% Attack Speed
+20 Movement Speed
+20% Critical Strike Chance
Unique Passive – Typhoon: After every 5 basic attacks, the next basic attack must deal 125 magic damage to 3 enemies.
Unique Passive – Activate: Each time Typhoon is cast, one’s movement speed will be increased 5% for a short time.
Then: Scarlet Phantom

+30 Physical Attack
+40% Attack Speed
+10% Critical Strike Chance
Unique Passive – Frenzy: Crit strikes will increase the hero’s attack speed 35% and crit strike rate 5%, lasting 2s.
Then: Berserkers Fury

+65 Physical Attack
+25% Critical Strike Chance
Unique: +40% Crit Damage
Unique Passive – Doom: Crit strikes will increase one’s physical attack 5%, lasting 2s.
Then: Endless Battle

+65 Physical Attack
+25 Magic Power
+250 HP
+300 Mana
+5% Movement Speed
+15% Lifesteal
Unique Passive – Divine Justice: After using this ability, the next basic attack will have an additional 70% of physical as true damage. This effect has a 1.5s. cooldown.
Unique Passive – Chase Fate: When Divine Justice’s effect is triggered, it will increase the hero’s movement speed 15%.
Finally: Blade of Despair

+170 Physical Attack
+10% Attack Speed
Unique Passive – Despair: Deals an extra 10% damage to an enemy in any abnormal state (stunned, knocked airborne, transformed, disabled).
Shortly Hard Crit And Damage Build For Lesley

Lesley Battle Spells
Flicker

Teleport a certain distance in a specified direction. For 1s. after the teleport, duration of disabling effects received will be reduced 50%.
Inspire

Greatly enhances the hero for a short period of time. The next 8 basic attacks will ignore 25 pts of target’s physical defense and increase your hero’s attack speed 55%. Lasts 5s. Cooldown 60.0s
Retribution

Deals 600-1440 pts of true damage to nearby jungle monsters or minions and increases damage to monsters by 30% within 3s (Damage will increase with level).
Lesley Emblem Set
Physical Attack Emblem Set
I think this build is perfect if you want to spam her first skill without exhausting your energy (as basic attacks and her ult replenishes them). Also, her first has a 35% Crit Chance, so the Scarlet Phantom is a perfect combo item for her. Also, when chasing enemies, the +20 MS from the Windtalker is a good thing, too!
My version of this item build for Lesley has a Thunder Belt in place of the Scarlet Phantom, so that no one can escape from me while I deal massive damage on them. Haha
already did that no effect on tank
lol its because its a tank. tanks are long lasting