New weekly quest

What's all about the new weekly quest in dalaran for nightmare?

Nightbane I mean

Bumping this topic, from what i've seen Nightbane is in Karazhan and u need to summon it with an item that u can obtain through a questline but it seems way to complicated for a normal weekly.

The weekly quest says its located in OS but i went there, full runned it, and it obviously wasnt there.

Does anyone have an idea of what to actually do?

Just did whole quest chain for Nightbane summoning in Karazhan, and we killed it but it does not count for this weekly quest, so is it done in OS Heroic mode with all 3 dragons or what?

OS doesn't have HC mode.

I runned a OS10 and OS25 raid and neither of those worked out.

Yes i do know that, but have u done it without killing 3 side drakes, doesnt that count as HC?

and does karazhan have 10 heroic mode?

seems really a nightmare at all lol, warmane implement a new feature and no info about it, very warmane!! eventually info will show up.

This was an unintended leftover from frostmourne and it has already been removed in-game.