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In Path of Exile 2, the Double Herald setup is a tech that allows for Herald of Thunder and Herald of Ice to proc off each other simultaneously, triggering a chain reaction that can clear entire screens with one hit.

Understanding how the Herald skills interact with each other in order to pull this off isn't strictly required, but it's helpful information nonetheless, especially for players wanting to theorycraft their own build ideas later on. Here's how to implement this tech in your build and an explanation on how it works afterward.