The Formless

 

Slime Body

At 1st level, you become one with the ooze. Once per short or long rest, as a bonus action, you can transform your body into a slimy version of yourself for 1 minute. you gain the following benefits while transformed:

• You are resistant to poison, acid, and slashing damage and are immune to the poison condition.
• You have advantage on Constitution saving throws
• When a creature within 5 feet of you hits you with a melee attack, you can use your reaction to deal 1d6 acid damage to that creature. The damage increases do 1d8 at 6th level, 1d10 at 10th level, and 1d12 at 14th level.

Subsume Body and Mind

At 6th level you may subsume the remaining flesh and potential last memories of your victims. When you touch a creature that has died within the last hour, you may consume the body. The recently deceased creature cannot be a construct, ooze, plant, or undead. Doing so grants you temporary hit points equal to your warlock level + charisma modifier. You may use this feature once per short or long rest.

In addition, you may attempt to gain a portion of the creature's memory. Doing so allows you to gleam the last hour of the creature's life, learning any information, at the DM's discretion, from that knowledge.

Amorphous Form

You learn to harness your ooze powers even when outside your Slime Body. Starting at 10th level, regardless of whether you are in your Slime Body or not, you are Immune to the grappled condition and can squeeze through any opening at least 1 inch wide.

You also gain resistance to poison and acid damage outside of your Slime Body. While in your Slime Body these resistances become immunities.

Consume them Whole

At 14th level, while in your slimy form, you can use your action to try to grapple a creature. On a success, the creature is engulfed by your body, and it is considered grappled for the duration. You don't need to have free hands to use this feature.

In addition, when you grapple a creature in that way, you can spend one hit die to absorb part of that creature. When you do so, you deal damage equal to the number rolled on you hit die + your Charisma modifier, and when you regain the same amount of hit points.