Sister Blackbeak was a shryke who worked for Lentil Spume in the Phrax Glade. She wore a cloak stitched together from pieces of the robes of the Guardians of Night. Sister Blackbeak acted as the commander of the Phrax Glade Death-Cheaters. The Death-Cheaters under her command referred to her as The Most High Academe. She was killed by Rook during the Battle of the Phrax Glade. She appeared in The Blooding of Rufus Filatine.