Specifically, I use the crucible mod that causes shield crush and spectral shield throw to deal lightning damage per energy shield on your shield instead of scaling off of armour or evasion. This mod is available on shields and I am using an Emperor's Vigilance with flat ES also being added by the crucible tree, resulting in a whopping 840 ES
Spectres in general can be a bit tricky. One should not forget that minion builds are the most complex genre of builds in Path of Exile. This guide will walk you through everything you need to know and then some. Below you can see the latest update video I made on this build from YouTube.
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path of exile crucible guide