Heart of stone.

[Doomboy911]

So I remember hearing about a class that had my interest where one of the main features involved removing your heart and replacing it with one of stone, I'm afraid I found this in pathfinder and I'm doing my best to keep it 3.5. So I wanted to know if anyone's heard of such a feature or class?

[Undertucker]

You might be thinking of the Heart of Stone spell, from Spell Compendium. Allows you to replace your heart with one made of carved stone.

[Doomboy911]

Ten points to Undertucker that's exactly it.