Zed Guide

Utterly ruthless and without mercy, Zed is the leader of the Order of Shadow, an organization he created with the intent of militarizing Ionia's magical and martial traditions to drive out Noxian invaders. During the war, desperation led him to unlock the secret shadow form—a malevolent spirit magic as dangerous and corrupting as it is powerful. Zed has mastered all of these forbidden techniques to destroy anything he sees as a threat to his nation, or his new order.

ABILITIES

Contempt for the weak ( Passive )

Whenever Zed basic attacks an enemy below 50% health, he deals an additional magic damage (doubled against monsters). This effect cannot occur on a given target more than once every 10 seconds.

Razor Shuriken

Zed and his shadow both throw their shurikens, each dealing physical damage to the first enemy they pass through, and 60% physical damage to each additional enemy.

Living Shadow

Passive: Whenever Zed and his shadows strike an enemy with the same ability, Zed gains Energy. Energy can only be gained once per cast ability.

Active: Zed's shadow dashes forward, remaining in place for 5 seconds. Reactivating Living Shadow will cause Zed to swap positions with this shadow.

Shadow Slash

Active: Zed and his shadows slash, dealing physical damage to nearby enemies.

Each enemy champion hit by Zed's slash reduces  Living Shadow's cooldown by 2 seconds.

Enemies hit by a Shadow's slash are slowed for 1.5 seconds. Enemies hit by multiple slashes take no additional damage but are slowed more instead. 

Death Slash ( Ultimate )

Active: Zed becomes untargetable and dashes to an enemy champion, marking them. After 3 seconds, the mark triggers, dealing physical damage plus a portion of the damage dealt to the target by Zed while the mark was active.

The dash leaves a shadow behind for 6 seconds. Reactivating Death Mark causes Zed to switch positions with this shadow.

Runes

Source: https://www.mobafire.com/league-of-legends/champion/zed-107
 https://na.leagueoflegends.com/en-us/champions/zed/