[SmG Phoenix]

Blade of the Ruined King is actually outrageously good on Zed. The attack speed damage and BotRK active adds on to the Death Mark.

I rarely get to full build as Zed, and my build varies, but I recommend this for a teamfight-assassin Zed:

1 Mercury Treads (Tenacity)
2 Bloodthirster (Good amount of AD/LS)
3 Maw of whatsitface (Good amount of MR and the magic shield passive, and the extra AD from its passive is pretty good with your life steal to regen some health back when you're low)
4 Black Cleaver (Armor pen, armor reduction, Health, CDR - Perfect for spamming your E to farm all day)
5 Warmog/Randuin/Sunfire/Frozen Mallet (Any Tanky items, for giving you more survivability)
6 Mercurial scimitar (Remove CC or any debuffs from enemies so you can get to the ADC without getting kited too hard)


You don't need to build them in any specific order, but you can swap Item 5/6 for a Guardian Angel or Blade of the Ruined King, but I never liked GA anyway, so good luck ;p

So Blade of the Ruined King isn't a core item. It's a situational. That was my point.