Although this would require a bit of lore bending, it would make a great Fallout 4 addition. Many people have complained the DC Mutants are underpowered/weak and wan't to fight the straggelers of the Master's army. Well, maybe the survivors have survived for many years and hardened themselves and formed an elite group of dark skinned mutants. Another way to include this would to have yet another freak accident in an Enclave facility, but i prefer the former.
I think that this idea of enhanced "Black Mutants" would be a nice little miniboss wich could add a bit more difficulty and be an intresting additon to Fallout's cast of monsters.
All opinions are appreciated
If you liked this you might like my other Fallout 4 suggestion: (http://www.gamesas.com/bgsforums/index.php?showtopic=951700)