Sylvanas Windrunner has been defeated by the European Echo guild players. The tenth, and final, boss of the Sanctum of Domination in World of Warcraft: Shadowlands. Echo defeated Sylvanas by reducing her health to 45%, after 176 pulls.
Disappointment
Usually the encounter ends when Sylvanas reaches 50% health, on all difficulty levels — and players were under the impression that would be the case in Mythical Mode too. Unfortunately, this wasn't the case at all, but the Echo guild managed to achieve a world first.
Victory
You can see exactly how the Echo players achieved this victory. A well deserved celebration after hours of effort and failure.