Assasination early and snowball potential.
Burst damage and target access
Hitting a champion with 3 separate attacks or abilities in 2s deals bonus adaptive damage.
Gain a burst of Lethality and Magic Penetration after using a dash, leap, blink, teleport, or on leaving stealth.
Collect eyeballs for champion and ward takedowns. Gain permanent AD or AP, Adaptive for each eyeball plus bonus upon collection completion.
Unique takedowns grant permanent cooldown on your Ultimate.
+18 Ability Power or +11 Attack Damage, Adaptive
Your first ability hit every 20s burns champions.
Gain 10% CDR when you reach level 10. Excess CDR becomes AP or AD, Adaptive.
LeBlanc's assassination playstyle synergizes perfect with the burst damage play-pattern of Electrocute, allows you to easily proc it with a [Q]->[R].
LeBlanc makes great use of Sudden Impact, gaining bonus Magic Pen and Lethality when entering a trade/fight with [W].
LeBlanc is all about kills and snowballing. Eyeball Collection is a rune that further pushes your gains for every kill/assist.
Ultimate Hunter allows you to snowball your early kills into the opportunity to pick up additional kills and roam with [R].
The added poke damage from Scorch is incredibly easy for LeBlanc thanks to point-and-click nature of [Q]. The added damage can be the difference between a kill and the enemy getting away.
Transcendence's mid-game CDR allows you to opt into a heavy AP stacking build or Magic Penetration for those big objective fights in the mid game.