Brain Rot will turn a zombie into an ally for a short while. It will attack other zombies until it dies and can be upgraded to explode on death. Dead Wire's main effect stuns zombies for a short duration, but the better use case for this mod is against Megaton Zombies.

What Ammo mod is good against megatons?

Best Cold War Zombies Ammo Mods

Our second pick would be Dead Wire. Not only does the electric-type damage deal critical damage to Megatons, once fully upgraded to Tier 5, it essentially turns any weapon into the old Wunderwaffe DG-2 from World at War.

What element is megaton weak to?

Megaton: Weak to Dead Wire electric bullets, so upgrade yourself at the Pack-A-Punch machine. Mimics: Weak to Brain Rot poison damage.