Searching "Eternal" D&D template

So, i read in a D&D book about a class called "Eternal" or some such, and was wondering if anyone remember or know which book it's in. I'm not sure if it was D&D 3.0 or D&D 3.5, but i remember reading about it at a friends place in a D&D book. Anyone know which book? Google was of no help...

This thread is off-topic for our site. When you signed up for Roll20 you agreed to abide by our Code of Conduct and this post violates the Intended Use section of the code. Since this is a question about roleplaying game mechanics aka D&D class, you’d be better served posting it on a general RPG site, like reddit/r/rpg , <a href="http://dnd.wizards.com/community" rel="nofollow">http://dnd.wizards.com/community</a>, or other similiar sites.