Homebrew Concubus (Incubus/Succubus) Species Details

A deadly combination of lust and beauty, most are found in service to higher level demons and often wield subtle illusions and enchantments to tempt their victims into committing heinous and unspeakable acts. Despite this, they are able to mingle with and corrupt most mortal races with relative ease. 

Succubi and incubi inhabit all of the Lower Planes, and the lascivious dark-winged fiends can be found in service to devils, demons, night hags, rakshasas, and yugoloths. Asmodeus, ruler of the Nine Hells, uses these fiends to tempt mortals to perform evil acts. The demon lord Graz'zt keeps Succubi and incubi as advisers and consorts.

Though legend speaks of them separately, any succubus can become an incubus, and vice versa. Most of these fiends do have a preference for one form or the other. Mortals only rarely see a succubus or incubus in its true form, however, for the fiend typically begins its corruption in veiled, insidious ways.

BEAUTIFUL CORRUPTERS
When tempting, a succubus or incubus first appears in ethereal form, passing through walls like a ghost to lurk next to a mortal's bedside and whisper forbidden pleasures. Sleeping victims are tempted to give in to their darkest desires, indulge in taboos, and feed forbidden appetites. As the fiend fills the victim's dreams with debauched images, the victim becomes more susceptible to temptation in everyday life.

Inevitably, the fiend enters the mortal realm in tempting form to directly influence a creature's actions. Appearing in the guise of a humanoid who has previously appeared only in the victim's dreams, the succubus or incubus seduces or befriends its victim, indulging all its desires so that it performs evil acts of its own free will.

A mortal bequeaths its soul to the fiend not by formal pledge or contract. Instead, when a succubus or incubus has corrupted a creature completely - some say by causing the victim to commit the three betrayals of thought, word, and deed - the victim's soul belongs to the fiend. The more virtuous the fiend's prey, the longer the corruption takes, but the more rewarding the downfall. After successfully corrupting a victim, the succubus or incubus kills it, and the tainted soul descends into the Lower Planes.

The succubus or incubus resorts to charming a victim magically only when necessary, usually as a form of self-defence. A charmed creature isn't responsible for its actions, so forcing it to behave against its will won't bring the fiend closer to the ultimate prize: the victim's soul.

DEADLY KISS
The kiss of a succubus or incubus is an echo of the emptiness that is the fiend's longing for a corrupted soul. Likewise, the recipient of the fiend's kiss gains no satisfaction from it, experiencing only pain and the profound emptiness that the fiend imparts. The kiss is nothing short of an attack, usually delivered as a final farewell before the fiend escapes. 

FIENDISH OFFSPRING
Succubi and incubi can reproduce with one another to spawn more of their kind. Less commonly, a succubus or incubus reproduces with a humanoid. From this unholy union, a cambion child is conceived. Invariably, the fiendish offspring is as wicked as its fiendish parent.

SLENDER AND TONED
Incubi and Succubi appear almost totally human, but are horned, clawed, with a tail and wings, and can be rather tall, but are always extremely attractive. They are always slender, well-toned, and are very rarely overly muscular, but due to their shape changing abilities, often tweak their appearances, or even change them completely, to suit their needs or the desires of those they seduce.

SOLO PRACTITIONERS
Most Succubi and Incubi live among mortals in any land but far from others of their kind. If they work in too great a number, their deception can be more easily discovered as their success depends greatly on their existence being unknown by their victims. 

After they have matured, they do not need to eat food as they are largely sustained by the life force of those they kiss, however they may eat to complete the mortal deception. This food does not sustain them as it turns to ash in the bellies.

MISSION OR EXILE
There are two main reasons that a Succubus/Incubus might go adventuring; first and most common is if they have been sent by a higher demon to infiltrate an adventuring party. The second and less common reason is if the lesser demon has been exiled for breaking a rule that their demonic master has set for them.

NAMES
These creatures will adopt any name that suits their profession. To know their actual name is to have power over them. Once their true name is known, that person becomes their  master.

Concubus (Incubus/Succubus) Traits

Concubi have various traits that facilitate their lustful existence

Ability Score Increase

Your Dexterity score increases by 1, and your Charisma score increases by 2.

Age

Concubi mature at the same rate as humans but can live centuries longer. Additionally, after they mature their appearance or physical body does not age past their prime.

Alignment

Concubi are often evil, but can vary greatly depending on their particular lifestyle or personality.

Size

Concubi are about the same size and build as humans, but are very toned and slender. Your size is Medium.

Speed

Your base walking and flying speed is 30 feet.

Darkvision

Thanks to your fiendish heritage, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern colour in darkness, only shades of grey.

Fiendish Nature

You are considered to be both Fiend and Humanoid, and you are considered to have the "Shapechanger" tag. Additionally, you are resistant to fire damage and vulnerable to radiant damage.

Shapechanger

As an action, you can change your appearance and your voice. You determine the specifics of the changes, including your coloration, hair length, and sex. You can also adjust your height and weight, but not so much that your size changes. You can make yourself appear as a member of another race, though none of your game statistics change. You can’t duplicate the appearance of a creature you’ve never seen, and you must adopt a form that has the same basic arrangement of limbs that you have. Your clothing and equipment aren’t changed by this trait.

You stay in the new form until you use an action to revert to your true form or until you die.

Silver Tongued

A creature of deceptive words, Concubi have proficiency with Persuasion and Deception.

Languages

You can speak, read, and write Common, Abyssal, and Infernal.