Blizzard has just announced that World Bosses will release on Thursday, December 16, meaning WoW Classic Season of Mastery will enter Phase 2. Season of Mastery is on a much faster pace than the initial Classic, going off of a 12 month cadence to speed things up.
Heads up! The world bosses Azuregos and Lord Kazzak will begin appearing on Season of Mastery realms on Thursday, December 16 at 3:00 p.m.PST (6:00 p.m. EST).This means the beginnings of some Season of Mastery players obtaining.
Read more on wowhead.com