As of 11/29/16, crafting the Zombie Slayer should no longer crash the game. If you made the weapon in a previous version I recommend tossing the old one and making a new one. Enjoy the slaying!
Found at Chem Lab under Utility.
Was having a lot of fun with the zombie mods but was sad that melee was so ineffectual(due to a few other mods and survival). Wanted to be able to machete them to the face and have them go down as lore intended. This machete should do the trick for the most part I hope. costs 1 cap to make.
NOTE: damage shown in screenshot is not base damage. base dmg is 120. 500% bonus is accurate though.