Lamia is a hero featured in Might & Magic: Heroes VI.
Lamia has been a Succubus for so long that her current incarnation is older than those of all the current Princes of Sheogh. Once a Shantiri Priestess during the height of the ancient empire, she is said to have seen it all and done even more.
Lamia's reasons for becoming a Succubus seemed to have stemmed from a wager with the Arch-Demon Azkaal, who was warring against the Angels and rapidly rising to his future title of Prince of Destruction. It is taken for granted in Sheogh that Lamia lost the bet, but Azkaal might argue the contrary.
Three decades later, in the fateful battle that saw Azkaal defeated by the Archangels Michael and Sarah, Lamia was by his side as his magical protector and consort. She is said to have smiled for the first time in 30 years when Azkaal's soul was whisked away and trapped in a powerful artifact which she herself had crafted.
Lamia only appears in Might & Magic: Heroes VI.