Diablo IV - Lord Zir

Lord Zir, also known as The Dark Master, can be challenged at World Tier 4.
In order to summon Lord Zir you will need to acquire Exquisite Blood (which you will need multiples of) from Legion Events and World Bosses. Thankfully, Legion Events and World Bosses are relatively easy to spot on the map. Legion Events are marked with a giant red circle, and if you are in the area of a World Boss you will see a timer appear on the right-hand side of your screen.
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