NHF – new heroes for Heroes V 3.1.

After Biara's failure, no one thought that the Overlord would associate with succubi. However, this misconception played into the hands of Lillian, a young demoness who quickly proved that deception and illusions are just as effective in Ashan as they used to be. Now, succubus magic requires practice.
Ashan will burn in flames, and Lillian will spark the fire, she says.

Here is a sketch of Lillian.