The cleansing process had been terrifying, and there were a lot of things which the team didn't understand. Driola was a necromancer, but she was yet to catch up.
After they helped her friend, she pressured a couple of the necromancers with a question. "What the hell was that? This was not how we cleanse people back in my place. We'd just enslave the spooky ghosts."
"This wasn't a ghostly possession," One of the necromancers corrected, "The demon empress herself had a grip on your friend's soul, hence, it was tainted. We had to put our best foot forward there."
"And the pyramid?" Driola urged, "I don't understand why it did all of that."