Estelle d'Astora

"But the d’Astora family rose to the Gemmer throne because they always shared a special bond with unicorns. If anyone can discover the moontears’ secrets, it would be a Gemmer princess. So perhaps it is the girls, and not us, who must open them."

- Queen Estelle while pretending to be Terra

Estelle d'Astora was the queen of the Gemmer guild.

The Unicorn Quest series
Estelle d'Astora was the queen of the Gemmer guild. She ordered the Gemmer army to hunt unicorns, causing the Unicorn Massacre.

When she tried to kill the last unicorn of Arden, she was turned into Queen Rock.

Secret in the Stone
Queen Estelle pretended to be a scholar named Terra and made Grandmaster Carnelian think she was a resident of Stonehaven.