Mutant is crafted with Magic Craft in Mabinogi. This page lists everything needed to make it, checked against the game as it exists today. The interactive planner lives in the Magic Craft Companion.
Recipe availability
Mutant is a rank 6 Magic Craft recipe with a best success rate of 95% at rank 1 and dan ranks.
Materials
Each craft uses
10× Mutant Rabbit Foot — drops from Mutant Rabbits (Outskirts District 1. Easy kills)
5× Mutant Plant Mucilage — drops from Mutant Carnivorous/Maneating Plants in the reserve
3× Sasquatch Heart — only from Poisoned Sasquatch (District 2, 40k HP). Not a guaranteed drop