Recaps

Gavin rescued Cordelia from Cyril Rosier, but the Ministry detained him in Azkaban, where he pursued Dark Magic and experimented with Horcruxes. The arc left Gavin weakening and manipulating Lockhart as he sought a way to make his Diary useful.

• Gavin and Cordelia were ambushed by Cyril Rosier and his Dark Wizards, and Cyril escaped with Cordelia after her Obscurus erupted.
• Gavin used Cordelia’s Trace to locate her, killed Cyril, and freed Cordelia, who accepted Gavin’s proposal before the Ministry detained him.
• In Azkaban, Gavin subdued a Dementor, contacted Cordelia through a mirror, and discovered that his Obscurus had grown while his life force had declined.
• Gavin learned Dark Magic from Cyril and Sirius, then used Legilimency to obtain Rookwood’s Horcrux instructions.
• Gavin escaped Azkaban as a seagull and split a fragment from Cyril’s soul, placing it in his Diary as a Horcrux.
• Gavin planted potatoes near the mountain summit and found that his life force and restorative potion were failing him.
• Gavin rejected the Diary’s proposed vow, learned the Memory Charm from Lockhart, and erased Lockhart’s memories until he could make him believe Gavin was his father.