She bargained with Camio to learn the language of serpents, sacrificially killing a unicorn to fulfil her part of the deal. Her demons chatted politely with the lurking Dementors to distract them from reflexively attacking her – the Patronus Charm was too much of a Light spell for a Dark witch such as herself to ever master. The silly angel-blessed trusting unicorn just walked right up to her! It was sad, but it had to be done. It got her access to the Chamber of Secrets – her own private hideout in the school since Harry was oddly disinterested in returning there. It was quite nice once she’d made a cosy reading nest with a big pile of cushions, and had gotten her friends to get rid of the Basilisk corpse. Forneus said it was delicious. Camio meanwhile went on a gleeful journey of destruction with the power he’d earned from the unicorn’s death, defacing and defiling sacred and holy sites across the UK that helped empower the angels he hated. If he killed anyone during his rampage, he didn’t tell her about it, and she didn’t ask.