Concubi are infamous for their ability to drain someone’s soul with their kiss.

As an action you can kiss your target draining their soul and deal 1d8 psychic damage, this damage increases to 2d8 at 5th level, 3d8 at 11th level, and 4d8 at 17th level.

The fiendish blood running through you greatly  augments your defensive abilities as well as your offensive abilities making you a larger threat on the battlefield. You have advantage on saving throws against spells and other magical effects. You are immune to fire damage and the charmed condition.

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

Concubi are ageless demons, typically reaching adulthood between the ages of 15 and 19 that do not die of old age.

Due to their fiendish natures, concubi often tend toward evil alignments. Neutral or good succubi are extremely rare, but not unheard of. They have no particular tendency toward or against lawful or chaotic alignments.

Succubi are shapeshifters; however, in general, they are similar in size to most other humanoid races. Your size is Medium.

Your base walking speed is 30 feet. You also have a pair of wings that are strong enough to allow you to fly and you gain a fly speed of 30 feet. You cannot use this fly speed if you are wearing medium or heavy armor or if your current form granted by your shapechanger trait does not have wings.

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 color in darkness, only shades of gray.

As an action, you can transform your appearance or revert to your natural form. You can't duplicate the appearance of a creature you've never seen, and you revert to your natural form if you die.

You decide what you look like, including your height, weight, facial features, the sound of your voice, coloration, hair length, sex, and any other distinguishing characteristics. You can make yourself appear as a member of another race; you lose the flying speed granted by your wings trait if your current form does not have wings; otherwise, none of your game statistics change. You also can't appear as a creature of a different size than you, and your basic shape stays the same; if you're bipedal, you can't use this trait to become quadrupedal, for instance. Your clothing and other equipment don't change in appearance, size, or shape to match your new form, requiring you to keep a few extra outfits on hand to make the most compelling disguise possible.

Even to the most astute observers, your ruse is usually indiscernible. If you rouse suspicion, or if a wary creature suspects something is amiss, you have advantage on any Charisma (Deception) check you make to avoid detection of your true nature.

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