Lethality

Flat armor penetration vs targets.

When you need it

AD Assassins vs squishies.

Item examples

Serrated Dirk, Duskblade of Draktharr, Youmuu's Ghostblade.

Details & formulas

Best vs low-armor targets. Vs tanks use % Armor Pen.

How to counter it

Squishies need Edge of Night or Banshee's Veil vs burst. Stack HP + Armor (Sterak's Gage, Plated Steelcaps).

Champions that build it

AD assassins (Zed, Talon, Kha'Zix, Qiyana, Pyke) and AD casters (Jhin).