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The following is taken from the Elftown Wiki.
Succubi is the plural of succubus.
This creature is stunning and extraordinarily beautiful, with flawless skin and raven hair. Her form, so tempting, also has an otherworldly side. Large bat wings unfurl from her back, and her eyes glow with a sinister desire.
Succubi are the most comely of the demons and they live to tempt mortals. A succubus is 6 feet (1.82 m) in its natural form and weighs about 125 pounds.
Succubi are not warriors. They flee combat whenever they can. If forced to fight, they can attack with their claws, but they prefer to turn foes against eachother. Succubi use their polymorph (shapeshifting) ability to assume a human form, and can maintain this form indefinitely.
Their preferred tactic when dealing with heroes is to feign friendship and create an opportunity to be alone with one of them, so she can apply her life-draining kiss. Succubi are not above taking the role of a damsel in distress when encountered within a dungeon.
A succubus can drain energy from a mortal by luring one into some act of passion, or just by a kiss.
It is also an expert in charming, tongues (it can speak all languages) , polymorphing, suggesting things in the mind of unwilling, and it can teleport itself. it also possesses a little telepathic powers. A succubus has darkvision, so it can see in the dark, it is also immune to poison, for the succubi come from a plane where poisons are omnipresent.
They make good characters for people who want to play with spellcasters that rely on enchantment effects and still have a few tricks when unseduceable creatures appear. Such as mages that rather have a new tome than a girlfriend.