The Chained Prince

There is something you want, something that can be given to you. All you need to do is give a part of yourself and what you want will be given to you in time. The Chained Prince wishes for Freedom, they wish for chaos and control. 

The contract you have made gives them a piece of where they need to be and their hunger for freedom, they will offer you something you need. You will accept. That will be your undoing. 

Expanded Spell List

The Chained Prince 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:

1st: detect magic, tasha's hideous laughter

2nd: enlarge/reduce, magic mouth

3rd: slow, water breathing

4th: confusion, grasping vines

5th: geas, telekinesis 

Two Heads

At 1st level, your pact with The Chained Prince grants you a portion of his bifurcated nature. A small tumor appears upon your neck, occasionally manifesting a small eye or ear when you will it to. As a free action you can will the tumor to become one of the two. When in use, you have advantage on saving throws against being blinded, deafened, stunned and being knocked unconscious, you also have advantage on Wisdom (Perception) checks when this feature is in use. 

Roiling Insanity

At 6th level, you can expose your enemies to the unbridled madness your patron constantly experiences. As an Action you can direct your tumours eye towards a creature you can see within 60ft. That creature must make a wisdom saving throw, the DC is 10 + your charisma modifier. On a failed save, it takes 3d6 psychic damage and is stunned until the end of it's next turn. You can use this ability once per short or long rest.

Duality

Whilst you may not share your patrons war with themselves, The Chained Prince shares his insights on living as one part of a whole being. At 10th level, when you cast a spell with a range of self, you split the effects with an ally within 5ft of you. If you do so, that creature also gains the effects of the spell, though the duration is halved. You regain the use of this ability during a short or long rest.

Abyssal Intervention

The Chained Prince, the ruler of the Abyss, has dominion over its forces and their power. Beginning at 14th level, you can call on The Chained Prince to intervene on your behalf when in dire need of assistance.

Imploring The Chained Prince's aid requires you to use your action. Describe the assistance you seek, and roll percentile dice. If you roll a number equal to or lower than your Warlock level, The Chained Prince intervenes. The DM chooses the Nature of the intervention. If The Chained Prince intervenes, you can't use this feature again for 1d10 days. Otherwise, you can use it again after you finish a Long Rest. If the intervention succeeds you are granted with a piece of The Chained Prince's madness, you take 15d8 psychic damage and gain a flaw from the following flaw table, determined by a D100. 

d100	Flaw (lasts until cured)
01-20	"Someone is plotting to kill me. I need to strike first to stop them!"
21-40	"There is only one solution to my problems: kill them all!"
41-60	"There is more than one mind inside my head."
61-80	"If you don't agree with me, I'll beat you into submission to get my way."
81-00	"I can't allow anyone to touch anything that belongs to me. They might try to take it away from me!

 

At 20th level, the symbiosis you have made with The Chained Prince is at its strongest, your call for intervention succeeds automatically, no roll required.

Suggested Intervention: 

The Chained Prince bestows his magical gaze onto his servant. Two extra eyes appear on each side of the users own eyes and begin to emanate an abyssal aura, the user may look toward one creature that they can see within 120 feet of then. That target must make a DC 23 Wisdom saving throw. Unless the target is incapacitated, it can avert its eyes to avoid the gaze and to automatically succeed on the save. If the target does so, it can't see the user until the start of his next turn. If the target looks at the user in the meantime, it must immediately make the save.

If the target fails the save, the target suffers one of the following effects of The Chained Prince's choice or at random:

1. Beguiling Gaze. The target is stunned until the start of the user's next turn or until they are no longer within line of sight.

2. Hypnotic Gaze. The target is charmed by the user until the start of the user's next turn. The Chained Prince chooses how the charmed target uses its actions, reactions, and movement. 

3. Insanity Gaze. The target suffers the effect of the confusion spell without making a saving throw. The effect lasts until the start of the user's next turn. The user doesn't need to concentrate on the spell.