The other thing I want to do related to mutations would be making it so Slime and Troglobite mixed together wouldn’t be an underground based slime, but a large offshoot of Slime that would be kinda oily and black in color. You’d sport a number of advantages like immunity to acid and fire damage, but you could still catch fire, it just wouldn’t cause you pain or hurt you directly, but with the slime-troglobite, you’d have a large amount of natural armor that built up while waiting and staying still, but it slowed you down akin to Ponderous 3. If you caught fire, then you’d start losing amounts of natural armor and trading it for speed. The more limbs of your’s that were on fire, the lower your natural armor, but the higher your natural speed would be, and of course you’d be setting fire to anything you stepped on/got near, so while you might slaughter that bandit who turned a flamethrower towards you thinking it’d be an easy kill, the building you might be in or next to would catch fire and we all know how fast fire spreads. A building collapsing on you wouldn’t kill you, but it would likely destroy anything you’re carrying or have equipped (more coverage means less chance for fire and every 10-25 steps, do a check to see if the armor slides off unless it’s a full 100% coverage item like hazmat or ANBC suit with a gas mask equipped) and moving out of the rubble would take at least 600 movement points per square. You’d be like the T-1000 in that regard, very little could actually hurt you and cause you pain, but when something could hurt you and cause you to really feel pain, it would hit like a freight train. Hunger and thirst could also be lowered for additional natural body armor or healing, the slime pets would be something you activate now instead of it being automatic. Most doors and windows could be bypassed by activating an ability to slid through some cracks/under the door, but any stuff you have on hand would be left on the spot unless the door was partially damaged, then some smaller items could be carried through under the idea of being temporarily stuffed inside your body.
NPCs would always be hostile to you or running away since you’d look like some vaguely humanoid-shaped oily blob that moved along the ground slowly or charging at them/something else while on fire. Only wearing stuff like ANBC Suits, Hazmat Suits, full Survivor gear all over, and maybe power armor would you not be like, leaking outside the sides and then you’d have no ugly or beauty modifiers, you’d need a special mutation to allow you to actually speak with them since you’d lose your vocal chords otherwise.
You’d have a fair amount of natural volume for items since you’d just be putting them inside you, but it would be mainly for small items like foods, screwdrivers, maybe a crowbar, lockpicks, but if you put food or drink in your body, there’d be about a 20% chance every fifty steps taken for one food or drink item to be consumed. Most drugs, if not all of them, would be entirely incapable of affecting you, but you’d not feel pain for purposes of CBMs (you’d need a special mutation that would adapt the CBM’s function to your body and it could only adapt so many, simulating the eventual bionic slot limit Kevin wants to implement) or painkillers (aside from the few things that could cause pain, then be careful because the painkillers won’t work). You would cease being human in every shape of the word, killing zombie children, innocents, other survivors, etc would have no negative impact on your morale since you’d just view them either as potential bio-mass to breakdown to add to your body, or for survivor NPCs, potential kidnap victims to inject with mutagens and serums to make them another post-threshold slime-troglobite blob creature.
