They're not like standard Antiproton weapons (which have no proc and an in-built +20% crit severity instead).
Voth Antiproton weapons come with 3 modifiers like other very rare non-hybrid weapons, and their special proc is a 25% chance on a critical hit to reduce a target's damage output by 9%.
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Voth Antiproton weapons come with 3 modifiers like other very rare non-hybrid weapons, and their special proc is a 25% chance on a critical hit to reduce a target's damage output by 9%.
From there at the bottom table you should be able to find the others.