They all have different names. The first series is called the Original Series, the second is called The New Prophecy, and the third The Power of Three. Erin Hunter is coming out with a new series called the Omen of the Stars. There is only one book out yet in that series which is called The Fourth Apprentice.
I think you're talking about a series as in trilogy, saga, or quintet. I don't know the name of anything other than that, but I just wanted to clear that up.
A six-book series is commonly referred to as a hexalogy.
As a three-book series is a trilogy and a four-book series is a tetralogy, a five-book series is a pentalogy.
The 4th warrior cat series is called Omen in the Stars.
A group or series of five books is a quintet.
Septology
Your question doesn't make sense. There is a series called power of three but nothing called power of six. The next series is omen of the star starting with The Fourth Apprentice.
Yes, there is a fourth book in the "Vampire Academy" series called "Blood Promise," which was released in 2009. The series consists of six books in total.
The Leven Thumps series is an incredible book series and I am hoping that there will be a next book out
A four-book series is called a tetralogy.
Book six of series three-power of three
please resubmit your question with more details.. WHAT SERIES?
The third book in the Leviathan series is called Goliath.
a series of unfortunate events
A series of the same books on the same theme by the same author is called a book series or a book franchise.
The third book in the series is called A FAREWELL TO CHARMS
The third book of the Dormia series is called: The Shadow Tree.
The fourth book of the Power of Three series is called Eclipse.