Bastardized Seal
Blanche clicked her tongue disbelievingly. "Tsk. They actually used possession! That's something that only the most paranoid people use. If they aren't paranoid, then they're just despicable."
Possession, as Blanche spoke of it, was something that caused the death of the person that was possessed after the original caster 'left' that body.
As far as Blanche knew, this type of seal wasn't even found nowadays. The knowledge had already all but died out, though one could still read about the horrors that one could commit using possession.
But even if they could read about the horrors about possession and the damage it had caused, they weren't able to find the right sequence of runes that could produce such an effect.
Yet, beyond all odds, they had managed to find someone that had been possessed by someone – and they had used it as a means of escaping from Blanche and Alec.
That just pissed her off.