Diablo 4 Season 12 is already generating a lot of discussion, and much of it comes down to a single phrase tucked into Blizzard's patch notes: "new Butcher Lair Boss." On paper, the headline feature of the season is Bloodied Sigils, a new endgame mechanic that ties the Butcher more directly into high-level dungeon play. But that brief and unexplained mention of a lair boss has raised eyebrows,...