Elizabeth Bathory was a witch - I mean, how could she not be? And Zelda here is a descendant who specializes in invocation and hexing - incorporating blood magic. Did a little stage magic whens he was younger, occasionally still does. Her soul is contracted to the demon Paimon, like the majority of her family has been for centuries. They created a card/dice game called Valko's Gambit that allows players to gamble with their soul. If you lose, demons come to collect. It's a way for their family to satiate their obligations without really getting their hands dirty. The game itself has been around since 1866 and is an occult staple.
There are 4 Valko sisters altogether, the oldest and craziest being Yersinia, who would easily make a go at the nexus for power. Which is why Zelda and Istvan have shown up to keep that from happening.
THEIR SON (if anyone wants to play him) is Kalman - he's the combination of two stage magicians from powerful witch lines, and somewhere in between Istvan's chaotic energy and Zee's dark grace. He spent a good amount of time as a baby with Teodora, hence why he looks slightly older than he is and the freckles ♥
Demon connections, witch lines, people who know about Valko's Gambit - anything! Always up for random interactions!