Machine Sword is a Small Sword in NieR: Automata.
"A sword wielded by machine lifeforms."
- "An improvised blade used by machine lifeforms. It may be made from scraps, but it gets the job done." 
- Bought from Pascal's Village weapon trader.
- Level 1
- "The more old records I read, the more fascinated I become by the species known as humans. We machines must do all we can to preserve these precious artifacts and continue to record their contents."
- Level 2
- "I see from the records how important predation and reproduction were to human survival. And yet, they viewed such acts as sinful. I wonder why?"
- Level 3
- "I found a famous human book today, but after reading it ten times, it still makes no sense to me. What possible attraction could there be to such a thing?"
- Level 4
- "Eureka! It seems the answer was in front of me all along! I am simply incapable of comprehending anything - about humanity OR the world in general! Ah, how wonderful it is to live in a world swaddled in mystery!"