Patron Lord of Slime

You have made a pact with the demon lord Jubilex or another powerful slime that resides in the Underdark. Followers of this pact have their skin and blood become corrosive, and as the pact grows stronger, can shift into a gelatinous form.

Expanded Spell List

Your patron 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.

Spell Level	Spells
1st	grease, absorb elements
2nd	melf’s acid arrow, spider climb
3rd	gaseous form, stinking cloud
4th	freedom of movement, vitriolic sphere
5th	antilife shell, cloudkill

Corrosive Touch

Starting when you devote yourself to the Lord of Slimes at 1st level, you can deliver a touch of acid to one creature within your reach, forcing the target to make a Dexterity saving throw against your spell save DC. On a failed save the creature takes acid damage equal to 1d10 + your warlock level and is poisoned until the end of the its next turn. On a successful save the creature takes half damage and is not poisoned.
In addition, when a creature touches you for the first time on a turn or starts its turn while touching or grappling you, it takes 1d6 acid damage. If you aren’t incapacitated, you can prevent this damage when a creature touches you. Any nonmagical weapon or armor made of metal or wood that you touch starts corroding. If you are continuously touching a wood or metal item for 1 minute, the item takes a permanent and cumulative -1 to attack and damage rolls, or AC. If its penalty drops to -5, the item is destroyed. Your corrosive touch can eat through 1-inch- thick, nonmagical wood or metal in 10 minutes.

Acid Blood

Starting at 6th level, your patron’s corrosive slime runs through your veins. You have resistance to acid damage.
In addition, as a reaction when you take physical damage, you cause acid to spray from your wound; each creature within 5 feet of you takes acid damage equal to half your warlock level.

Gelatinous Form

Starting at 10th level, your patron grants you the ability to enter a liquid state while moving. When you move on your turn, you take only half damage from opportunity attacks, and you can move through any enemy’s space but can’t willingly end your move there.
On your turn, you can move through any space that is at least 3 inches in diameter and do so without squeezing. When you stop moving, the regular squeezing rules apply if you’re in a space one size smaller than you. You can’t willingly stop in a space smaller than that, and if you’re forced to do so, you immediately flow to the nearest space that can fit you, back along the path of your movement.

Slime Lord's Lair

Starting at 14th level, as an action you can cover a 20 foot square on the ground centered within 60 feet of you with ooze. The ooze lasts for 1 minute and has the following effects. The covered area is difficult terrain. When the ooze appears, each creature standing in its area must succeed on a Dexterity saving throw or its movement speed is reduced to 0 and it takes 3d6 acid damage. A creature that enters the area or ends its turn there must also succeed on a Dexterity saving throw or take 3d6 acid damage and its movement speed is reduced to 0.
Once you use this feature, you cannot do so again until you finish a short or long rest.

DM's Guild: Mordenkainen's Codex of Allies