The Demented

While most warlocks will serve a single patron and be gifted with their eldritch crafts, some make a deal with a Collective. The Demented is the general term of a collection of fragmented psyches that congeal into a mass of equal parts peace and madness, with nearly limitless knowledge and chaotic power. What this warlock may offer to this patron is a sense of unity, to be the single body to house the many minds.

Demented Spells

The magic of your patron ensures you always have certain spells ready; when you reach a Warlock level specified in the Demented Spells table, you thereafter always have the listed spells prepared.

When casting these spells, the effects may exude traits befitting the patron. A Collective member may act as part of the illusion or act as the sentient servant, and hostile effects may be a result of chaotic energies from the mass.

[Note: Destructive Wave Will Not be automatically added into your spells known in Dnd Beyond. This is due to it being part of licensed content and had to be left out for this subclass to be published.]

Demented Spells

Warlock Level	Spells
3	Comprehend Languages, Blur, Eldritch Blast, Mirror Image, Unseen Servant
5	Fear, Sending
7	Freedom of Movement, Mordenkainen's Faithful Hound
9	Destructive Wave, Mislead

Dissociative

Level 3 Feature

With the numerous minds that you now possess, the transfer of truths can be manipulated. You aren't lying if you are someone who never knew the truth. And, with the slew of personalities within, you could be anyone.

You gain Advantage on Performance checks any time you are attempting to act like someone other than yourself. You also gain Expertise in Deception.

Eldritch Assault

Level 3 Feature

The sheer mass of the Demented Collective invites a chaos that wants nothing more than to lash out, and your patron allows you to harness that aggression using your eldritch magic.

You can now cast Eldritch Blast as a melee cantrip with a reach of 5ft; if you hit a creature in this way, you can add extra damage equal to your proficiency bonus to the damage roll. If a creature provokes an Attack of Opportunity, you can use the melee version of Eldritch Blast for the attack.

Collective Knowledge

Level 6 Feature

Multiple minds can beget multiple skills, and you can now make better use of that fact.

As an Action, you can choose to amplify a skill with knowledge from the Demented Collective. Whenever you make an ability check using that skill, you are proficient in that skill and you can make it as a Charisma check even if it normally uses a different ability. This effect lasts for 1 hour, and you can’t use this feature again until you complete a Long Rest. You can also spend a Pact Magic slot to regain one use of this feature (no action required).

Mirrored Psyche

Level 6 Feature

You harness the chaos of the multiple minds within your patron's collective, calling them forth to aid you in combat.

Once per Short Rest, you can cast Mirror Image without using a spell slot and without using verbal or somatic components. You can also cast Mirror Image in this way again after you have used your Magical Cunning ability.

While Mirror Image is active and as a Bonus Action, you can cast Eldritch Blast. After doing so, one of your Mirror Image duplicates is destroyed.

Additionally, if a Mirror Image duplicate is destroyed by a creature, whether by an attack or a magic effect, you can use a Reaction to cast Eldritch Blast once at that creature, so long as that creature is within range and line of sight.

Tandem

Level 10 Feature

You have managed to corral the chaos and make proper use of the multiple minds within.

You can take one additional Magic Action on your turn. When using this feature, you can only cast one spell of level 1+ between the two Magic Actions. Once you use this ability, you can't do so again until you finish a Short Rest or use your Magical Cunning ability.

Additionally, when you cast Mirror Image, you gain a total of four duplicates instead of three.

One of Us

Level 14 Feature

It is time to bring out your friends, and the Collective is out for blood.

While you have Mirror Image active and as a Bonus Action, you can detach one of your duplicates to act on its own. This Duplicate is a summoned creature that uses the game statistics of you at the time of casting, except its Hit Point maximum is half as much; it also shares the same benefits that you gain from Eldritch Invocations. It is Friendly to you and creatures you designate, it obeys your commands and acts on your turn in combat, to which you can decide whether it acts before or after you on your turn. You are able to have it act after you on the turn in which it has been summoned.

The Duplicate does not retain any effects from spells, magic items, potions, or similar effects; however, it is able to gain these effects once it has been spawned. For example, if you are currently affected by the Bless spell, the Duplicate would not receive the benefits of that spell upon being created, but it is a viable target for the spell after being created. 

The only Attack the Duplicate can make is to take the Magic Action to cast Eldritch Blast, which is benefited by the Eldritch Assault feature, and Eldritch Blast is the only spell known by it. It can not take Bonus Actions, and the only Reaction it can take is one that would allow it to move and/or cast Eldritch Blast (such as an Attack of Opportunity).

If the Duplicate is within 5ft of you while you are under the effect of Mirror Image, it also benefits from the spell's effect.

The Duplicate lasts for 1 minute, or until it is dismissed by you (no action required). If it drops to 0 hit points, it is destroyed.

Once you create this Duplicate, you cannot do so again until you finish a Long Rest.