Zeus's Protection Order on Herc

Oh, in case you didn't know, Zeus has placed his protection on Hercules. If you forget, these lovely gods and goddesses would love to remind you:

1.01 Treasure of Zeus

Strife: No god can destroy Hercules without being fried forever by Zeus. Am I right, or am I right?
Ares: You're half-right. Obviously we can't attack him directly. But sometimes a little strife can lead to a major catastrophe.

1.03 What a Crockery

Ares: Mother, I thought you knew. I really had no idea you cared so much about the chalice.

Hera: I want the perpetrator!
Ares: Dead? No can do. It was Hercules-- and you know how Zeus feels about little bro. Daddy's put his protection on him-- preventing us gods from killing him.
Hera: Hercules?
Ares: What? Am I missing something here?
Hera: Zeus made a promise to me when he made us that chalice. Anyone who takes it from its rightful place-- is condemned to death.

Ares: Then by Zeus' own words-- his protection of Hercules is off.

Hercules: What do you want?! If you're here for the chalice, just take it and leave us alone!
Ares: What I want is to see you suffer. When you grabbed Hera's chalice, you lost Daddy's protection, and now, I can destroy you.

Ares: I could have destroyed you long ago, if not for Zeus's special protection!

Strife: Ares couldn't do this sooner 'cause Zeus swore he'd smash any god who put the hurt on you! But you blew that when you stole the chalice.

(Jason and Iolaus return the Chalice, and Zeus takes away Ares's huge lightning ball)
Ares: "Nooooooooooooo! Noooooo! Why protect him again, Father?! I was so close! What about me?! I have needs!

Young Hercules: Cheiron's Warriors

      If it wasn't for Zeus's stupid protection order- Ares cut off the thought. Zeus had put Hercules under his special protection: No Olympian god was allowed to harm a hair on his little head. And even without the order, gods didn't kill other gods. That was the sort of thing that would set a nasty precedent.