I need help to create a doomsayer character, since i have his theme ready but currently i don't have acess to the books to find a suitable class build path (Anything from any book is clear, except some crazy exploits that no sensible master would allow).

I wish to create a doomsayer who thinks the end is coming and the only way to survive is to get strong. Every city he stayed he would warn people that the end was coming and the only way to resist would be to fight the hordes of evil, anyone who couldn't fight would die in the end of the world. He is a devote worshipper of Tharizdun, but he doesn't know his god true nature and thinks he is actually a good god that is warning his followers of the end of the world. The character sees visions of the end of the world and think he has to help humanity to prepare itself and at the same time prepare himself of what is to come.

The lore is not fixed yet, so it can adapt itself to the class/build.

So i ask if anyone could contribute with classes/prestige classes/builds that could fit this character.