Immortals Cant Fight Unless Challenged

As for me, I did the stupidest thing in my life, which is saying a lot. I attacked the Titan Lord Atlas.
He laughed as I approached. A huge javelin appeared in his hands. His silk suit melted into full Greek battle armor. “Go on, then!”
“Percy!” Zoë said. “Beware!”
I knew what she was warning me about. Chiron had told me long ago: Immortals are constrained by ancient rules. But a hero can go anywhere, challenge anyone, as long as he has the nerve. Once I attacked, however, Atlas was free to attack back directly, with all his might.

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The Titan's Curse, Chapter 17