Ahead of the Curve: G'huun
Defeat G'huun in Uldir on Heroic difficulty or higher, before the beginning of the Battle of Dazar'alor.
10/20/2018
Ahead of the Curve: Argus the Unmaker
Defeat Argus the Unmaker in Antorus, the Burning Throne, on Heroic difficulty or higher, before the release of patch 8.0.
01/29/2018
Ahead of the Curve: Kil'jaeden
Defeat Kil'jaeden in Tomb of Sargeras on Heroic difficulty or higher, before the opening of Antorus, the Burning Throne.
09/13/2017
Ahead of the Curve: Gul'dan
Defeat Gul'dan in The Nighthold on Heroic difficulty or higher, before the opening of the Tomb of Sargeras.
04/11/2017
Ahead of the Curve: Helya
Defeat Helya in Trial of Valor on Heroic difficulty or higher, before the opening of the Tomb of Sargeras.
02/26/2017
Ahead of the Curve: Xavius
Defeat Xavius in the Emerald Nightmare on Heroic difficulty or higher, before the opening of the Nighthold.
12/18/2016