Valeska is a character in Might and Magic: Heroes VI.
Once a Priestess of Elrath tasked with the education of Slava's children, Valeska found herself banished from the Duchy of Griffin for betraying Duke Slava after he rejected an Imperial decree - an act of profound treason in her unforgiving eyes.
Humililated and furious, Valeska turned to the Inquisition, an ideal refuge for one seeking a renenwed sense of purpose - and suitable opportunity to vent their anger.
Now, however, whereas Valeska's devoition to Elrath hasn't waned, her ire towards Slava has, and she wishes to elicit her pardon.
Valeska is an Inquisitor.
The Emperor's Will: Slava needs to defeat her in order to proceed. He banishes her from the Griffin Duchy.
There is a Necromancer version of her in game files. That version does not appear in the game itself, however.