The whole 5 issue story arch is worth a read, but as with a lot of comic short storylines, the final issue is the key. And the key in this book is the appearance of the White Phoenix of the Crown! You can pick up the Endsong as 5 separate issues or as a graphic novel including all books plus sketches from the artists.
Writers - Greg Pak
Pencilers - Greg Land
Inkers - Matt Ryan
Editors - Sean Ryan