Another agent was discovered by Velentra while escaping the laboratory. He was immediately killed, reanimated as an undead, and forced to confess everything. Velentra is now sealing off the lab. Calanthia has already been resurrected, and it appears Velentra has recovered ancient forbidden tomes in pursuit of Reville Lupius's complete resurrection.
If this report fails to reach you, I too have likely been turned into one of her undead. Requesting immediate backup.