Quote Originally Posted by Bixby View Post
When you get your 12 atma items, you turn your Zenith relic into an Atma relic. It keeps the same stats as the Zenith, and has its iLevel raised to 100.

You then need 13,500 tomes to purchase all 9 books. Each book you finish increases its associated stat on your Atma relic. When all 9 books are finished, you go back to Jalzahn and he will upgrade your Atma to an Animus.

Here's a nice FAQ on the Zodiac weapons.
I'm curious about the statement in bold. There have been many posts around this forum showing players on lodestone that already have the animus. And there are only 4 books available(until next update).