Mutation
A horrific consequence of radiation exposure. At least the arm is still somewhat useful.
Sell Creep Price30Description
Mutation is a gun that fires a slightly homing continuous beam with heavy recoil, leaving a trail of red liquid . Mutation also turns enemies red, though this is a purely cosmetic effect.
Synergies
If the player has 
Alien Engine , its flame will turn green, igniting enemies with permanent green fire . Alien Engine also grants flight while held.
If the player has 
Bionic Leg or 
Shock Rounds , Mutation's beam turns blue, leaves puddles of electrified water, and its ammo capacity is increased to 800. The player is immune to electricity while Mutation is held.
If the player has 
Monster Blood , 
Bloody Eye , 
Bloody 9mm , 
Bloodied Scarf , or 
Blood Brooch , Mutation poisons enemies.
Notes
- Mutation is not a proper goop -spraying weapon, unlike the
Mega Douser , the 
Plunger , or the 
Fossilized Gun . Unlike those three, Mutation's "stream" loses all momentum and immediately ends when you release the trigger.
Trivia
- The synergy between the Mutation and Bionic Leg/Shock Rounds may be a reference to Tetsuo from the 1982 manga series Akira . Tetsuo similarly possesses a bionic arm, and famously undergoes extreme and disturbing mutations. The synergy's name, "Neo Tech, Yo" also seems to allude to Neotokyo, the setting where the story takes place.
- "Didn't Need Two Anyway" refers to the look of the weapon in-game, which envelops the player's whole arm.
This visual effect is also shared with
Robot's Right Hand , 
Robot's Left Hand , 
Heroine , 
Flame Hand and 
Megahand .
Unlock Method
Create 10 guns using any Muncher .