With Diablo 4’s Season 8 revamp to the Boss Ladder, bosses are seeing some changes to their loot rules when it comes to Unique items – namely, dropping fewer in certain difficulties and guaranteeing at least one drop from their specific pools.
Patch 2.2.0 PTR Patch Notes Season 8 Blog Post Season 8 Overview
In the Season 8 Patch Notes, Blizzard outlined the specific changes coming with the new Lair Boss system and their loot: