Malcanthet, Queen of the Succubi

Either through a curse or by your own choice, maybe even to save your skin, you have accepted a bargain with Malcanthet, the queen of the succubi.  She has granted you with wondrous abilities as you become one of her spies and soldiers, living only to do her bidding.  You're not sure what her plans are, but they surely involve much more than simply taking you into her personal guard. 

You have been enthralled by the queen, and now live to follow her bidding as you grow in her power and become one of her thralls.  Her thralls are witches (female warlocks) who, over time as they grow in power, eventually will become powerful succubi themselves.   As your powers grow, as your body takes on the form of a succubus,  you begin to feel the incredible power that your Mistress has given you.  At first, you were not sure that you had made a good decision, but as your power grows, you begin to look forward to serving Malcanthet.

Malcanthet is the queen of the succubi, seducing fiends who work in both the Abyss and the Nine Hells.  Malcanthet acts as a personal envoy to Asmodeus himself, though she has been known to pursue her own plans.  Her thralls are only willing to serve their mistress and will not obey any other fiend.

Expanded Spell List

Your Mistress 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.

Fiend Expanded Spells

Spell Level	Spells
1st	bane, command
2nd	calm emotions, blur
3rd	glyph of warding, sending
4th	compulsion, confusion
5th	geas, mislead

Enthralling

You can charm one humanoid that you can see within 30 feet.  The target must succeed on a DC 14 Charisma saving throw or be magically charmed for 23 hours. The charmed target obeys the fiend's verbal or telepathic commands. If the target suffers any harm or receives a suicidal command, it can repeat the saving throw, ending the effect on a success. If the target successfully saves against the effect, or if the effect on it ends, the target is immune to this fiend's Charm for the next 23 hours.  You can only charm one target at a time, and you can only attempt to charm someone once per short rest.  If you attempt to charm a second humanoid, the charm on the first one end.  At the end of the condition, the charmed person is aware that you somehow affected its thought processes.

You are beginning to take on the form of a succubus, starting with small spikes that have become visible at your temples.  A short, prehensile tail tipped with a tiny spike-like stinger is now growing from the base of your spine.  Tiny, leathery wings have begun to grow from your shoulder blades.  The pupils of your eyes have begun to split, looking much like those of a cat, and have begun to turn yellow.  They may even glow when you are in darkness.  To conceal all of these changes, you have been given the ability to polymorph into a normal version of yourself at will.  It is a bonus action to drop this form and assume your true self.  Beware, a dispel magic of any kind will also drop the shape and reveal your true self.

Seducing Thought

At 6th level, when you charm a humanoid, the saving DC is now 16.  If you kiss the target, the saving DC is 18.  You now have a telepathic bond with that person that has no restriction on its range, including other dimensions.  You are always aware of where that person is.  When you cast Charm Person at higher levels, however, instead of being able to affect more than one person, the duration of your spell instead begins to increase by one hour per spell level.  Later on, when you begin to cast a Geas, this telepathic bond will be present through that spell also.

Full Succubus Form

When you reach 10th level, you have finally taken on the complete form of a succubus.  Your horns are fully grown, 4 inch spikes that rise from your temples.  Your tail is nearly as long as you are tall, with a full spike-like stinger that can be used as a bonus attack, doing 1d6 damage with a bonus to hit equal to your dexterity modifier.  Your tail has a strength of 10, (and a dexterity equal to yours) which is just enough to grasp onto something and hold you in place (like a monkey).  You now have huge bat wings, reaching out to a wingspan that is twice your height when you let them out.  You have a flying speed of 40 feet, as long as you are in your succubus form.  While in this form, you have resistance to fire, lightning, and slashing from non-magical weapons.

Kiss of the Succubus

Beginning at 14th level, when you kiss another humanoid that is willing, or you have charmed in any way, the victim must make a Constitution saving throw against a DC matching your spell casting ability.  Failure means they will take 5d10 psychic damage, or half on a successful save.  The victim's hit point maximum is also reduced by this amount, which will last until they finish a long rest.  The target dies if this effect reduces its hit point maximum to 0.