As the weakest of monsters you do not possess any special attributes. -1 to all ability scores.

Slimes are born fully formed and don't age, thus they have the potential to live forever.

You have the alignment you had before your reincarnation, however, you are starting anew and may be any alignment.

Slimes tend to be between 6 inches to 2 feet in diameter. Your size is small.

In their base form slimes have a walking, and climbing speed of 25, and a swimming speed of 30. When in another form you gain that forms speed.

As an action, you can ingest a Small or smaller non-living object and cast an enhanced version of the identify spell, without requiring components. When you do this you learn everything about the object and can copy it. Once copied, you can gather the materials it's composed of and instantly make copies of it within yourself. (See Slime Stomach)

You may also cast the Guidance cantrip at will, however the DM may dictate how often it can be used and what information you receive.

As an action, you can devour anything that consents to be Devoured or is Dead and has a challenge level that is equal to or less then half your level. When devoured you can store the creature indefinitely, use great sage on it, and/or consume it in an attempt to gain some of it's abilities and skills. When you consume them, roll 1d20: 1-9 you learn nothing, 10-19 you gain the ability to take its form (you can retain a number of forms equal to your character level), 20 you can permanently steal one supernatural or magical ability from the creature and use it in any form that can reasonably do so.

The process of Devouring the creature will destroy the remains. This is different than placing something in your Slime Stomach.

While in Slime Form

You are resistant to temperature damage (Fire and cold).
You are resistant to slashing/piercing/bludgeoning.

While in slime form, you cannot be grappled or held by anything and can slip through tiny spaces. (Ie; rope or chains wont hold you and you can flow through a mouse hole easily)

You may change your form to one learned from Predator for X hours per short rest . Where X equals your character level.

By use of magic, you can see everything around you perfectly within 60 ft.

Your stomach is infinite and acts similar to the bag of holding, with a few minor differences, one you can carry 1500lbs in your stomach. Your stomach can analyze, copy, manufacture and refine and process whatever is inside it. As long as you know the processes to do so.

Living creatures can only be placed in the stomach by consent. They can be sustained by the appropriate materials if absorbed.

As a slime you don't require the normal requirements of life.
You do not need to eat, sleep, or breathe.