Because he was Mind Controlled by the jailer during Shadowlands, he killed a ton of people and was a raid boss until we broke free his MC. Because of that, he has serious PTSD, so he took Dragonflight off to go wonder, and it has been about 5ish years at the time of the trailer. Hes supposed to be the middle ground between the void and the light but he's afraid he is too far gone. Hes likely going to be the main character for both the next 2 expacs, possibly the third, especially since Xal'atath players a major role in TWW and Midnight is about the void lords sieging the sunwell.