The models in blender were better, just madly worse in viewport.
5 mutant mobs (including 4 mutant mob and 1 used mob):
- Mutant zombies
- Mutant Drowed
- Mutant Skeleton
- Mutant Wither Skeleton
- Mutant Blaze or something like that
The models aren't compeleted (only boneshapes) so you can still download it and fixed it. This were all of my effort on this models