Who killed Y'Shaarj in World of Warcraft? Titan? It is still the magic ancients and Leiden, but if it is the magic ancients, then in terms of time, Yasha

Y'Shaarj and ancient gods are natural things and cannot be completely destroyed. Unless you want to destroy Azeroth, the Titan just sealed them, and Hou Yaozong got the heart in the box, which confirmed it from the side. Y'Shaarj was sealed, not killed. I hope my answer can help you.