I am the ultimate killing machine, used not once but TWICE, I can be...

I am the ultimate killing machine, used not once but TWICE, I can be made by humans. What am I?

Answer: war

#Hard #What am I?

I am the ultimate killing machine, used not once but TWICE, I can be...
I am the ultimate killing machine, used not once but TWICE, I can be...
I am the ultimate killing machine, used not once but TWICE, I can be...

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