Your patron is a mysterious ooze, an ancient amorphous blob whose nature is unformed and deadly. It might come from the underdark, the lower planes, or it could even be from a dark unexplored crevasse of the material plane. Its mind is beyond the comprehension of mortals and alien by the standards of demons; conforming to no standards, it acts with unknowable purpose. The ancient ooze might be unaware of your existence or entirely indifferent to you, but the secrets you have learned allow you to draw your magic from it.

Entities of this type include Ancient Slimes, Jellies and Puddings, Elder Oblexes and even the Demon Lord Jubliex themself.

Expanded Spell List

The Ancient Ooze lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Ancient Ooze Expanded Spells

Spell Level	Spells
1st	grease, inflict wounds
2nd	blur, web
3rd	protection from energy, stinking cloud
4th	confusion, freedom of movement
5th	cloudkill, telekinesis

Liquid Movement

Starting at 1st level, your patron bestows upon you the ability to manipulate your body as though you have the constituency of slime. As an action, you can move up to 20 feet through spaces no more than an inch in diameter. You must end your movement in a space that can accommodate your full size. Otherwise, you take 5 force damage and return to the space you began this movement.

Change Shape

Starting at 6th level, you can use your action to magically change shape into an ooze-humanoid hybrid or into an ooze, or back into your true form, which is humanoid. Your statistics are the same in each form. Any equipment you are wearing or carrying is absorbed by the new form. You revert to your true form if you are reduced to 0 hit points.

While in ooze or hybrid form you benefit from the following traits:

• Acid Immunity (Ooze form only). You are immune to acid damage.
• Acid Resistance (Hybrid form only). You are resistant to acid damage.
• Blindsight (Hybrid or Ooze form only). You have blindsight out to 30 ft in Hybrid form, which extends out to 60 ft in Ooze form.
• Pseudopod (Hybrid or Ooze form only). Your gelatinous body is a natural weapon, you can lash out with a pseudopod to make unarmed strikes. If you hit with it, you deal acid damage equal to 1d6 + your Strength modifier instead of the bludgeoning damage normal for an unarmed strike.
• Spider Climb (Ooze form only). You can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Create Green Slime

Starting at 10th level, as an action, you can create a green slime (see "Dungeon Hazards" in chapter 5 of the Dungeon Master's Guide). The slime appears within 30 feet of you.

If you find yourself in need of creature statistics for Green Slimes, use the following: A Green Slime is a small to medium ooze with an AC of 5 and 1 hit point. Their Strength, Dexterity, Constitution, Intelligence, Wisdom and Charisma are all 1. They have blindsight out to 30 feet, and are blind beyond this distance. Officially they have "no ability to move", but if it suits your game consider giving a movement and/or climbing speed of 5ft.

You can use this feature a number of times equal to your Charisma modifier (a minimum of once). You regain all expended uses when you finish a long rest.

Slimy Organs

Starting at 14th level, your internal organs take on a slimy, ooze-like form. You have resistance to bludgeoning, piercing, and slashing damage from nonmagical attacks. In addition, whenever you suffer a critical hit or are reduced to 0 hit points, all creatures within 5 feet of you take acid damage equal to your level in this class.