In the thread I started on adding craftable chemical warfare agents, Kevin confirmed that vesicants (blister agents) like Mustard Gas and similar would work on zombies. I would expect substances that are toxic and cause rapid, significant damage to cellular structures in humans would be able to kill zombies. The blob might provide them some resistance, so you might need MORE than a regular person, and it would be able to repair/revive them after poison “kills” them; but in the end the blob is still basically just driving a mutated human body whose cellular structures still have to do business with chemistry and physics. I suspect toxins that could kill a human fast (neurotoxins, vesicants, necrotoxins, cytotoxins, cyanide, etc) would work, but things that will kill slowly, like radiation poisoning (even acute radiation poisoning from an extreme dose may take a day to kill you from the DNA damage) for example, would not, as the blob can compensate and repair.
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