Wowhead's BlizzCon Interview
Raid lairs were introduced in Patch 12.1, with the first one being Nymrissa Wavecaller in the Tidebound Grotto raid lair. Lairs are a one-boss raid that replaces a traditional World Boss and has additional Normal, Heroic, and Flexible Mythic difficulties, acting as a supplement to the main raid of the patch.
The Gearhold raid lair in Patch 12.2 features the Noctinaxx boss encounter. A large Azerite bat has been discovered, and players must take him out before it causes too much trouble.
An enormous azerite bat, Noctinaxx, is one of Eclipse’s new raid bosses. Found lurking within its own Lair - The Gearhold - Noctinaxx awaits you on World, Normal, Heroic, and flexible Mythic difficulties.
According to Paul Kubit in our Blizzcon Interview, the plan is for the difficulty of this raid lair to be aimed at an early Mythic raid boss. This will help guilds who have completed AOTC but may not have the roster to tackle 20 man Mythic.
