Unfortunately, I must disappoint you, Moon Called is a separate book and no other is connected with it. It's a pity, I admit - the incantation to the Lady was superb. For those of you who haven't read the book, I include it below. Enjoy!

I am the servant, Thou the Lady,
I am the hand to obey, the weapon to use,
the body to serve-
I was born to Thy service, and by Thy will I
live, to die at the time ordained.
Let now Thy great light come into me - I am
a cup to be filled that I may do what is
needful in this hour.
Blessed be Thy commands - let my ears hear
them, my hands and feet to obey -
Blessed be ever the Will which moves me
take me for Thy everlasting service-"

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Aetheling's Grove - dedicated to Andre Norton