Quote Originally Posted by Kraco
However, I have no idea what it meant that Zed abandoned the rest of the key spirits and then fused with Amil Gaul. What the heck did that symbolize? Bah, I'm just happy this is over.
Reviving an old thread, but I just finished the series today and here's my take on that:

When he charged and slashed at Amil Gaoul, he was still asking about what power he's seeking. For the entire series, he was seeking something beyond strength. In the last scene, he gains wings and flies off. The thing he was seeking, along with several other characters (Noa, Rebecca, Mirette), was freedom. They each lived confined lives and seeked ways to gain freedom. I think Rebecca said it best when she "died" the first time - that she wanted to be reborn as a bird and fly without barriers. Zed was granted that power by Amil Gaoul at the end.

One thing I'm really not sure about: who was Morima? This line sounds like something Rebecca would say, and Zed seemed to recognize her. However, Rebecca is dead for sure. And the shard thing on her forehead is different.