You can use a bonus action to expand, condense and change the shape of your body. Your statistics stay the same when morphed. You cannot morph any items you are carrying. If you morph into an object, you can function as that object if you have an understanding of how it works, eg: morphing into a bucket, you can carry water in you. You can change the color of certain parts of your body and how they feel using your non-acidic coating. You can be as creative as you want with your morphing. Choose a form that you have been for more than 5 years total, this form is your signature form. Any part of the Ooze that detaches from the main body for more than 10 seconds is no longer part of the Ooze and becomes mundane regular acid, depending on the amount of mass lost, the DM can decide if you lose hit points and how many you lose. If you have morphed into an object and do not have any items visible on you, you are indistinguishable from a regular object. If you have morphed into a creature, the DM may call for you to roll a deception check to fool other creatures that you are the creature you have morphed into, you can gain advantage on this roll if you have morphed into that creature multiple times or if you have a detailed understanding of it's behavior, when you morph into your signature form, you do not need to make this roll. You retain your statistics when you morph into anything. You can only morph into creatures or objects you have seen before. You can morph into a creature or object that is up to 2 sizes larger or smaller than you. If you morph into a creature or object that is 2 sizes larger than you, you are hollow inside. Morphing into your amorphous form or your signature form is a free action.

You can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check if you are in a suitable form.

Your Constitution score increases by 3.

You do not deteriorate due to age.

Your size is variable to what form you take but you have the amount of material equal to medium size. Your size is medium for any abilities, spells or effects that are dependent on size.

You have a walking and climbing speed of 30. The climbing speed is only when you are in a suitable form.

You have a blindsight range of 60 feet and are blind beyond this radius, however, you can morph a method of sight to gain that sight as well eg: morphing eyes to gain regular vision. The blindsight is a combination of your innate magic and heat vision.

Due to you being an Ooze, you gain the following benefits:

• You know the acid splash cantrip using Constitution as your spellcasting modifier and can cast it without needing to use verbal components.
• Unarmed strikes deal 1d4 + STR modifier acid damage instead.
• You know the spell Acid arrow at level 3 and can cast it twice per short or long rest using Constitution as your spellcasting modifier and can cast it without needing to use verbal or material components, you may also regain 1 use of the spell by taking 1d4 damage.
• Enemies that hit you with a melee attack take acid damage equal to your character level + 2.
• You are Immune to Fall damage.
• You have Immunity to Poison and the Poisoned Condition.
• You have Vulnerability to Fire damage.
• You have Immunity to prone if you are in an amorphous form.
• You don’t need to sleep, don’t suffer the effects of Exhaustion, and magic can’t put you to sleep.
• You can eat almost anything, including metal, stone, and wood.
• You don't need to breathe and you don't feel pain. You may spend 6 hours in an inactive state for a long rest, you can still see and hear as normal in this state.
• You count as an Ooze creature type.

You can speak, read and write Common and Aquan. However, in order to speak, you must morph a way to create sound.

You may attempt to engulf a creature of your current size or less. You can engulf either 1 creature of your size, 2 creatures of 1 size less, 4 creatures of 2 sizes less etc. If you have engulfed an unwilling creature, that creature must make a strength saving throw DC 8 + your Proficiency bonus + your STR modifier (DC 8 + your STR modifier if hollow), on a successful save, the creature breaks free of your grasp and is knocked back 5 feet from you, on an unsuccessful save or if the creature is willing, the creature is engulfed into your body and restrained. They take 2d6 acid damage per turn unless you cover them with a protective membrane and cannot breathe unless you create some way for them to breathe eg: a tube to the outside of your body. If you completely engulf them, they have full cover against all effects originating from outside your body.

You can also take other actions, but it is up to the DM to say whether those actions are viable or not. Also, when you move, the engulfed creature moves with you.

An unwilling creature that is engulfed may re-attempt the saving throw at the end of each of their turns or another creature that is not engulfed can attempt to free the creature that is engulfed with a strength saving throw DC 8 + your STR modifier.

The damage increases to 4d6 at 5th level, 6d6 at 11th level and 8d6 at 17th level.

The damage die amount and type can be changed with Acid Control.

You can don or doff armor as an action. You can move through a space as narrow as 1 inch wide without squeezing, however, any equipment that is too big must be left behind.

You can use a bonus action to control the pH of your acid and by infusing it with your innate magic you can make your acid only dissolve certain substances.

Using your most potent acid, you can dissolve through 1 inch of metal, 2 inches of stone or 3 inches of wood per round. If you infuse it to only dissolve one of those substances, then the amount you can dissolve per round doubles.

This can affect your engulf by changing the damage die amount with the maximum not exceeding 12 (24 at 5th level, 36 at 11th level and 48 at 17th level), eg: changing the damage die to 3d4 from 2d6.

Whenever you are subjected to acid damage, you take no damage and instead regain a number of hit points equal to the acid damage dealt.