Your Constitution score increases by 2, and one other ability score of your choice increases by 1.

Most sapient slimes have no idea how long they existed before attaining intelligence. They do not, however, seem to ever age or degrade in any way. You are immune to magical aging effects.

Slimes tend to be friendly, curious and gregarious but don't have any particular set of ethics or a sense of culture. They most often conform to the alignment of the culture they choose to belong to, but tend towards chaos and neutrality.  

Your natural size is Medium. While you can alter your density to lose and gain height your weight doesn't change. Through your shape without form trait you are able to become a Small creature if you so desire.

Your height can be set anywhere between 3' and 6' 6". You tend to weigh between 150 and 250 lbs based on how much or how little you have been eating recently. 

Your base walking speed is 25 feet. 

Despite being a slime, your sapience has allowed you to develop a full suite of senses. Through the permeable membrane of your body you have the hearing, smell, taste, touch and sight of a human.

Even though you don't have a "tongue" you can still taste things that you dissolve for sustenance, though you find far more things palatable than a humanoid would. Anything you touch you can also consider to taste and smell if you want to.

Your field of vision is limited to the same as that of a human, attempting to broaden or enhance your vision without the use of magic is too taxing on your mind. 

Your natural blindsense as an ooze has weakened with these new senses. You have blindsense out to 10 feet. 

Your unique slime physiology makes you remarkably resistant to blunt force trauma and your own native acidity partially counteracts the effects of other acids. Your acidic nature makes you immune to disease. You can still be poisoned however, many toxins threaten the bonds that hold your amorphous body together. You do not need to breathe or sleep and magic can't put you to sleep. 

• You have resistance to bludgeoning damage and acid damage.
• You don’t need to breathe. 
• You are immune to disease.
• You don’t need to sleep, and magic can’t put you to sleep. You still need to spend 6 hours in no more than very light activity such as reading or keeping watch in order to benefit from a Long Rest.
• You still need to consume the same amount of food and drink as a Medium humanoid. You can consume any liquid or organic material, but still suffer the effects of toxins they might have. You can be poisoned and you can even become intoxicated from alcohol.

It is difficult for you to wear armor and use your full physical capabilities, however you have an incredible resilience. Your physical integrity is harmed by blades, blows, punctures and energy of all kinds much like a solid entity, but your gelatinous body naturally seizes to spread the energy of incoming attacks out to attempt to prevent harm. When not wearing any armor you have a natural AC of 10 + your Dex modifier + your Con modifier.

While slimes are capable of wielding weapons in their humanoid forms, many find it inconvenient. Luckily they are more than capable of defending themselves with their natural acidity. You have a melee attack you are proficient with that hits using your constitution modifier and allows you to deal 1d4 + your constitution bonus acid damage. 

If you have a creature grappled you may elect to deal this damage after each successful grapple control roll you make. 

Your true form is to be formless, nothing more than a glob of organic acid. You can control the membranes that keep your body cohesive to a surprising degree, though you are constrained by your mass and you need to remain as a single entity. You can freely control your own acidity and activate or deactivate your Solvent Self racial trait as a free action. You never cause harm to any object or creature with your acid that you do not intend to. You can make yourself more or less fluid, ranging from a puddle of viscous goo to a smooth gelatinous flesh-like firmness. You can safely store objects within your mass, following normal rules for encumbrance. 

You can move through spaces as small as 1/4-inch without squeezing and you can't be bound by nonmagical restraints. You can't wear armor, wield weapons or carry objects too large to fit through any space you wish to pass through. 

As an action you can shape yourself into any Small or Medium object or creature you have seen and spent at least a short rest studying. You can freely alter the form's height, build, facial features, coloration, sex, voice and any other distinguishing features. Regardless of the form you take you still look like a slime, translucent and gelatinous. Disguises or illusion magic still work on you as normal and can be used to hide your true nature. You can wield any weapons or armor suited for the shape you take, but non-magical armor must be removed before you change your shape and won't fit unless sized for your new shape.

No matter how you look you are still a slime, you do not gain any of the traits, abilities or movement modes of any form you take and it does not alter any of your ability scores. 

You can speak, read, and write Common and one other language of your choice.