Dragon Riddle

Name this item some have sought

More precious than silver or gold

A rarity to the ends of the earth

Ever since the days of old

A treasured and cherished piece of life

That can sing of love or woe

And change instantly from friend to foe

A denizen of life and love

Said to be sent from the gods above

I dare you oh meek, Come out and speak

And tell me the answer to this riddle we seek