Strength +3 intelligence-2

As a Feral slime, when you engulf in opponent, you deal 1d4+1 acid damage after every creatures turn, or every 6 seconds

When the ability engulf is used, you are unable to attack, and your speed is reduced by half. As of Level 10 you are able to play your character like normal, regardless to the fact of whether or not you have engulfed somebody.

Your opponent must make a dexterity saving throw to avoid your engulf ability, after they are engulfed they must spend every one of their actions to make a strength saving throw to break free.

Feral slimes can eat any organic or inorganic substance (dissolvable by acid) and gain HP. They gain 1d4 HP for tiny, 1d6 for small, 1d8 for medium, 1d10 for large, 1d12 for huge, and 1d20 for gargantuan. The time it takes to dissolve the substance is equivalent to its HP divided by 5.
At level 10, They gain 2d4 HP for tiny, 2d6 for small, 2d8 for medium, 2d10 for large, 2d12 for huge, and 2d20 for gargantuan. The time it takes to dissolve the substance is equivalent to its HP divided by 10.
At level 20, They gain 4d4 HP for tiny, 4d6 for small, 4d8 for medium, 4d10 for large, 4d12 for huge, and 4d20 for gargantuan. The time it takes to dissolve the substance is instantly on contact.

Intelligence +2

Your opponent must make a dexterity saving throw to avoid your engulf ability, after they are engulfed they must spend every one of their actions to make a dexterity saving throw to break free.

When the ability engulf is used, you are unable to attack, and your speed is reduced by half. As of Level 10 you are able to play your character like normal, regardless to the fact of whether or not you have engulfed somebody.

You may spend an Action to analyze the form of any creature or object you have engulfed. With an Action, you can change into or out of any form you currently have analyzed. While you are in these forms you have advantage on Deception checks to avoid being discovered as anything other than the form you’ve taken. If the form is a creature, you have the senses and movement of that creature, And ONE of its other abilities (Chosen when you first analyze that creature). While in creature form you cannot cast spells, unless you have an ability that would allow you to do so. If the form is an object, you have the appearance and hardness, but no other properties or abilities of the object. You also have Blindsight out to 25 ft while you are formed into the object.

Morphling slimes can take raw materials, and recreate other items. For example: If they take in (engulf) a mithril longsword, and they managed to have one or two mithril ingots, maybe add some gold coins and little bit of leather, and they can create a perfectly identical copy. If the material longsword happens to be enchanted, they can replicate that too at the sacrifice of some of its innate spell slots, which can only be used for this purpose. Morphling slimes gain slots at the same pace as Wizards.

Charisma +2

Your opponent must make a dexterity saving throw to avoid your engulf ability, after they are engulfed they must spend every one of their actions to make a strength saving throw to break free.

When the ability engulf is used, you are unable to attack, and your speed is reduced by half. As of Level 10 you are able to play your character like normal, regardless to the fact of whether or not you have engulfed somebody.

The slime that makes up Royal slimes causes euphoria and disorientation. Due to this when a royal slime engulfs a creature for a number of minutes equal to the creatures challenge rating, that creature is charmed to the Royal slime for as long as it and the Royal slime are in direct physical contact. Creatures that consume the slime of a Royal slime have disadvantage on all charisma saving throws involving the Royals slime, and have disadvantage on dexterity, intelligence and wisdom checks and saving throws due to being in a partially euphoric state.

At level 10, due to your status as royalty, you are able to summon a small Ooze which will arrive within the next 5 minutes. (the DM can choose any small Ooze to answer your call)

At level 20, due to your status as royalty, you are able to summon a medium Ooze which will arrive within the next 5 minutes. (the DM can choose any medium Ooze to answer your call)

The summoned Ooze obeys all your commands, and will automatically attack anyone that you attack. When out of combat you can choose to absorb the summoned Ooze to gain temporary hit points equal to the Ooze's remaining hit points.