Lightning is especially dangerous to those wearing metal armour, being burnt to a crisp by the energies unleashed.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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Lightning Attacks have the Ignores Armour Saves special rule against all armour types except Natural Armour.
Unless otherwise stated, a model with this special rule has both Lightning shooting and close combat attacks (though any spells cast by the model or special attacks are unaffected).