https://wowpedia.fandom.com/wiki/Pri..._Prince_Toreth
It was pre-existing.
Are you mad? Look around you, mortal. Do you not see that you stand upon sundered earth? Leave this place lest you suffer as my people and I have...
Why do you suffer?
Are you blind as well as insane?
I am a ghost - a cruel reminder of a civilization that has long ceased to exist - anchored to a land that I failed to protect.
Long ago - ten-thousand years past - I was flesh and bone, just like you. I was prince of this land and a dragon rider, blessed by Ysera of the Dream.
What is Ysera and how were you blessed?
Have you not heard of Ysera? Guardian of nature? Aspect of the Dream? She is the matron of all green dragons! Aye, it was Ysera herself that gifted my kingdom with her brood. We stood shoulder to shoulder with the noble creatures and they allowed us to ride them into battle against our enemies. All was well for many centuries... until...
Until what?
Deathwing's brood... Ysera's benevolence raised the ire of Deathwing - patron of the black dragonflight. They attacked us in our sleep! Many died on the initial surge but the greens rose to protect us.
<Prince Toreth points around the island.>
The bones are all that remains of the once great dragons. None were spared.
So why are you still here?
I was the last to die. As I felt my spirit leaving my mortal shell, I swore a blood oath.
<Prince Toreth shakes his head.>
A pact was made between this land and I: My blood for this world. I became the sole keeper of the history of my people.
I cannot rest until I am secure in knowing that the story of the dragon riders of Loreth'Aran is not lost in the passages of time.