As an adult, having matured physically within years yet aging slowly with a teenaged mind, Hellboy becomes the primary agent for the BPRD, alongside other human and quasi-human agents that include Kate Corrigan, a professor of folklore at New York University; Abe Sapien, an amphibian humanoid ("Ichthyo sapiens"); and Liz Sherman, a young pyrokinetic. Things change dramatically for Hellboy during the events of "" when he searches for Professor Bruttenholm after he disappears during an expedition in the Arctic. He finds his adopted father only to witness his death at the hands of a Lovecraftian frog monster. The search takes Hellboy, Abe, and Liz to the Cavendish Hall mansion, which is a trap established by Rasputin to lure Hellboy into an embrace of his own "destiny", with the assistance of Sadu-Hem; one of the spawn of the Ogdru Jahad. Controlled by the spirit of one of the ancestral Cavendish men, Abe impales Rasputin. Liz's firestorm then incinerates Rasputin's body alongside Sadu-Hem's and destroys Cavendish Hall. Soon after, during a visit to Bromwich Church, Hellboy gets a glimpse of his conception 300+ years ago and learns he has two human half-siblings; a nun and a priest whose spirits haunt the church after their deaths, attempting to stop Azzael from claiming Sarah.