Well before the Tomb of Sargeras raid is coming, we cleared Nighthold on Heroic difficulty. Steadily making progress from week to week, even the last two bosses, Elisandre and Gul'dan were no mach for us.
Even managing to finish the raid for a second time, we got the achievement for those of us, who missed the first time. Thanks for all the guildies, who were participating in the raid group, and also provided the team with consumables and flasks.
Keep up the amazing job, and see you in the next raid :)
And now some screenshots: