While Lord Zir may have been the big boss at the end of Diablo 4's Season of Blood, you can actually fight him as a regular boss on Torment world tier. Just like Grigoire, he's one of the few bosses you can target farm to get specific Unique items, including some of the ones that were introduced in previous seasons.
Each boss requires specific materials to summon them, but alongside Varshan, the Lord Zir boss is one of the least time-consuming to farm, since it's pretty easy to gather what you need to fight him. If you're curious about what the vampire lord drops before you face him, see our Diablo 4 boss loot tables. Otherwise, here's how to summon and fight Lord Zir.
