TIME FOR ANOTHER AWKWARDLY WORDED SUGGESTION FROM ME!
ahem So Nether creatures. They’re creepy, they’re spooky, they want to murder you horribly. What if you could gain some of their “2spooky4u” traits and get fun mutations like “Now you don’t have a face!” and “Your limbs are all noodly!” or “You now thrive on blood!” among other things. They’d generally do stuff to make you less human and more… Alien, for lack of a better term. This could be as simple as adding a Nether mutagen made from special nether bits, but who wants to have skin growing over their mouth and eyes (I mean, there’d be good ones too I suppose)? It doesn’t make sense to have you get them from base mutagen (I think?). Possibly Nether mutations are only gained from artifacts and being near portals? Some Nether creatures and induce it? I dunno.
Also, maybe some of them can scare NPCs off so you dont have random guys trying to steal yo’ stuff.
And here are some actual specific mutation ideas:
Blank - Your skin has grown over your eyes and your mouth, taking away your ability to speak… But not to see. Nobody knows how that works. Plus NPCs find it disturbing as hell.
Bone Spikes - Your bones extend out of your back and arms in spikes that sometimes harm attackers and add a bonus to unarmed combat… Though it probably hurts like hell.
Noodly - Your body becomes taller… And thinner… And taller… And thinner… Soon you’re nearly 15 ft tall and look like an Amigara horror! Plus it’s hard as hell to shoot you!
Twitching - Become the Gracken! Your hand twitch at VERY high speeds, adding boosts to most melee attack speeds.
And yeah. Random idea that’s probably really stupid.