The core concept of the build is to have Feint activated constantly. With 40% CDR, Feint at level 5 will have a cooldown of 3 seconds while lasting 3 seconds. With Shen's base attack speed and the energy regeneration from Ki Strike, combined with the Ki Strike cooldown reduction from Ki Strike and Feint, allows Shen to gain over 50 energy every 3 seconds while fighting. This means you can Taunt -> Feint -> Vorpal. Then use Feint whenever it's off cooldown and Vorpal as necessary to not overuse energy.

Added on is the effective tankiness of the build. Building heavy AP allows the shield to be ~500 points which resets every 3 seconds. Vorpal will hit for ~600 damage and heal for 80. Ki Strike will hit for ~200. The Zhonya's gives the armor against Physical damage. If magic damage burst is going to kill you, replace the Warmog's with a Bulwurk. I usually let the support buy the Bulwurk though to make sure my Ki Strike hurts too.

The Rylai's and MS Quints allow you to stay on your target to make sure you can keep Ki Strike going to not run low on energy. The Nashor's just adds the CDR and a bit of Atk Speed for less risk.

As a final note, ENERGY REGEN RUNES SUCK. 6150 IP for the 3 Quints that give 4.5 energy regen per 5. That's not even ONE energy per second. Shen has a bsae 10 regen per second. They are worthless.

People question my build. I have been yelled at and criticized in games. I even die and seem to feed top lane early. As soon as I hit level 16 for 40% CDR and go beyond Warmogs, I either don't die, or an entire team will waste ults and burst abilities to kill me. In which case, my team engages and aces the hindered enemies. If the enemy ignores me, I beat on the carries with Ki Strike, while putting Vorpal on the enemy being focused to provide support healing.

I know the build looks completely insane, but humor me and try it. Imagine having Barrier with a 1.5 second cooldown. GG right?