Juiblex

Your patron is the demon lord Juiblex, lord of ooze. Sometimes also known as the Faceless Lord, Juiblex is believed to be the creator of all oozes, slimes, and jelly creatures. While most demon lords practiced and enjoyed intrigue and tricking mortals, Juiblex cares only for consuming everything, bringing decay and ruin, and general destruction. For some unspeakable reason he has agreed to forming a pact with you, granting you a small amount of his slimy demon lord powers in exchange for something, probably involving destruction.

Expanded Spell List

Juiblex 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.

Juiblex Expanded Spells

Spell Level	Spells
1st	inflict wounds, hunter's mark
2nd	acid arrow, enlarge/reduce
3rd	bestow curse, slow
4th	vitriolic sphere, confusion
5th	cloudkill, passwall

Slime Sense

Starting at 1st level, the lord of oozes gives you the ability to sense other oozes/slimes/jellies that are within 60 ft of you and make them think you are an ooze. However despite any ooze/slime/jelly thinking you are similar to them, oozes do not show mercy even to their own kind, but if you are in combat with any creature of the ooze/slime/jelly variety they will prioritize you last.

Secret of the Ooze

Starting at 6th level, as a result of your pact with the lord of oozes your body gains a layer of gelatinous ooze under your skin giving you resistance to bludgeoning damage and acid damage. 

Pseudopod Growth

Starting at 10th level, your patron has granted the gelatinous ooze under your skin the ability to burst forth and form a Pseudopod lasting for up to 1 minute once per long rest. The pseudopod can form from a part of your body of your choice (though typically from the back) and can be controlled as if it were a 3rd arm. The pseudopod has a reach of 5ft, has the articulation and grip greater than that of a normal humanoid hand/arm, and if used to attack it counts as a Natural Weapon that uses your Strength modifier, and does 3d6 acid damage.

Oozing Companion

Starting at 14th level, ooze periodically reproduce through budding, including the ooze under your skin. The ooze under your skin writhes and shifts until a Black Pudding companion bursts forth. The Black Pudding is friendly to you and your allies, and the two of you share a telepathic bond while you are within 60ft of each other. It will carry out your commands to the best of its abilities, if you are incapacitated or absent it will act on its own prioritizing defending you and itself. You have a magical connection to your Black Pudding companion and it does not harm you to touch it, your items however are another matter.

It takes its turn on your initiative, though only acting if you command it to. On your turn you can telepathically order it to move as a free action. On your turn you can spend a bonus action to order the Black Pudding to attack or otherwise use its attack action (Such as Dashing, and so on). It takes its reaction as normal without having to be commanded, but can be ordered to specifically take or not take its reaction.

If the Black Pudding is killed, you can spend a long rest to spawn another one. You cannot have any more than one Black Pudding spawned at a time.

(To add the Black Pudding to your D&D Beyond Character Sheet, go to the Creatures tab, select Manage Creatures, under Add Creatures scroll to the Pet Category and make sure "Filter Using Pet Rules is checked).