by Rabbit » Tue Dec 14, 2010 3:13 am
The Lost Orb is one of the library quests.
Once you find the ancient library, you'll find that you can go inside the books. Walk up to the sparkly shelves in the library, and press the space bar to go inside a book. Each book has one quest associated with it.
The altar you describe is inside the book called "The Lost Orb".