Mysterios Dark Elf

Welcome young one!
Oh, I am so afflicted! I have lost my magic mirror!
If you will help me to find it, the Duke Byron Anhton will express his gratitude for your help.
I will hint at a place where you should search for the mirror, if you can guess three riddles

Here is the first riddle. If you will can not solve this riddle, you will have to kill the Preacher of Doom in order to guess this riddle once again.
It's not a dragon,
It's not a pet.
So, what is it?
Say you word: