Mutations and EFF

Mutations: separate from rarity

A mutation multiplies an ant's efficiency (EFF) on top of its rarity and level. Starlight is the big one at about 5x EFF. Others come from events and rewards: Candy from the Candy Rain event, Leaf from Leaf Mutation Potions and the Vine event, Bubblegum as an Index reward. Mutation Potions apply to one ant, so spend them on workers you plan to keep — a mutated lower-rarity ant can out-earn a fresh higher-rarity roll.