I have been trying for a few days but today was the day! I took Alric with me and we both got Fire Serpents. I ended up with two, which I will give to Fireslinger. Alric got one, which he will give to his brother, Luis.
Something I noticed on each drop: around the time before it dropped we each got Blackrock's sword. This might have just been a coincidence, but it was odd, as it seemed like Blackrock was saying "be patient, young wizard, what you seek will come if you just stick with it a little longer."
See ya in the Spiral!