One Mod Steel Path | Warframe 

While it is possible to do steel path with one mod as I have shown, I would advise against it. Just add literally anything to this base build and it will be considerably stronger.
Zephyr is very strong already so having a build for her is more of a quality of life rather than necessary. My build is not min/maxed.
While I primed the enemies in the six minute steel path run, its not necessary at all, and it is just a habit for me at this point. Even without the arcane, bane mod, and armor strip, the final build will still wipe enemies.