Ubuze, or Uby is a Draconequus, from before the Alicorn sisters, he has seen countless people die, watched passively as the great alicorn race descended into rubble at the hands of the Cataclysm, he watched, passively assisting, as a mother gave birth to two young Alicorn foals... and the last pure ones to ever live. He gave that mother peace, giving her knowledge of how the sisters would rule, to ease her into death.

But, having seen Discord go mad, seeing him get trapped into stone after whispering the tools of his imprisonment into a young unicorn's mind.
He waited. Watched from afar, as Sombra came and went, assisted with knowledge against Tirek...
Gave Celestia the strength to imprison her sister...
And now it's all coming to a head again.
The stars are helping Nightmare escape.
And he decides to take a more... Active... role.