Just like the S-genes ... mutations are different for every species of ITW!
I will share with you most of the ones available ... (this is hard to keep up with but I will do my best!

All Mutations ~

Female Guardian Mutations

Male Guardian Mutations

Keeper Mutations

Main mutations - usable for any ITW

Luna and Mattlock

Ildri Mutations

Fairy Mutations

Mermaid Mutations

BunnyFae Mutations

Neocridders Line Art Edits

Other Misc Edits (valentines, special species, accessories)