can i go use this on the legion if i wanted, does it destroy the ncr?

yup they die idk if i like that

I used it on the legion boss (not caesar because I killed him earlier in his tent) and it did not kill him. In my opinion, Archimedes is not a very good weapon. It is too slow and can only be ised once per day (or night) and it didn't even kill the guy I tried it on.