Although I didn't know what this so-called "Feast" actually entailed, one thing was for sure, Greya and Felicia were indeed here because of the incident at Black Castle.
"Black Castle has harbored undead for a thousand years, its own aura has also changed. Even if we completely eliminate the undead here, as long as this gloomy and resentful atmosphere lingers, more undead will accumulate," Sanders lamented through the Mind Ribbon, "What Greya and the others want to do is to fundamentally change Black Castle from its roots. From this point of view, Isabel is indeed prepared to overturn Isabella's thousand-year Blood Plan."
In other words, while Angel's cleansing of the undead was a cure, what Greya and the others were doing was rooting out the cause of the disease.
Hearing this provided some consolation to Angel.
