Starter items

Core items

Offensive items

Defensive items

Situational items

Pros: Insane Mobility, High AOE damage potential, High clear speed
Cons: requires some skillcap with her E skill and ultimate mechanics, no strong CC

Amplifiers: for augments I max out earlygame potential with some flat ad, armor pen and attack speeed
+10 Coda is must on any ad based champ, +75 HP is nice bonus for already awesome stats on marauder shield, +10 for claymore, because there is no good mod for batman's belt and most of the games your first core ready item would be claymore

build path: first of all most of u ask me why marauder shield over knife. Well because marauder knife is a total trash item. Its either waste of item slot for trash stats (30 ad(40 if moded) + 10% lifesteal(totaly useless stat in current meta)) or waste of 750 gold u can spend on something useful. On the other hand marauder shield in my opinion is by far the best jungle item with every stat being usefull and worth rushing for tier 4 asap. After that I just finish my core which is coda tier 3 and batman's utility belt. When core is ready its time to build claymore if your team is not behind and u still able to farm your jungle. If everything is going bad and out of control ignore claymore and stack defensive items.
Situational items section: Atomic axe - if entire enemy team(not only tanks) stacking armor like crazy; Mirror Master's Prism - if enemy team got more than one blaster or their controller building full power damage; Olimpus Gambit if nobody else build it in your team build it instead of your elexir; Ra's al Ghul's Robe - if u are so much ahead that build full asassin - build it as your only defencive item, and sell when it's passive on cd for something else; Megarod - if your team is much ahead but enemies went full turtle mode and u need to clear waves faster

ganking: build yor vendetta and use it just before u going in with W>basic attack->Q then based on the situation: build soul rend for maximum single target damage if fight continues or buld spirit wave if enemies flee under the tower protection for more harass. use ult if its more than one enemy and they close to eachother(or if no other way for your team to finish that last hit enemy) and you 100% sure u can escape after u use it.

teamfights: try to use your insane aoe damage potential - spam Q's and spirit waves. As for ultimate use it for the enemy's team stack imidietly if u 100% sure your team would follow your engage, dont save your ult only for last hit enemies because its huge waste of your damage potential

feel free to leave your constructive feedback, questions or if u spot a mistake(english isn't my native language)
Ill try to keep this guide up to date