Why does this Wizard build recommend Physical/Lightning Resistance?

Why does this Wizard build recommend Physical/Lightning Resistance? - Unrecognizable child playing jenga at home

I was following this LoD Hydra Wizard build and for some reason it recommends rolling Physical or Lightning Resistance for many items.

Why? What's so special about these two types? Does this build have other means of protecting against all other types of damage?






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Diablo 3 - Wizard Build Guide Lightning Hydra Archon




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