Their last-ditch effort at defeating the soul-shard trapped within the confines of the Locket was with the application of Basilisk venom. Acquiring the small phial of liquid was an adventure in and of itself, fraught with danger and near misses all along the way. Their first trip back to Diagon, then Knockturn, almost turning into an impromptu visit to Bellatrix Lestrange’s waiting arms. Months of hard work, blood, tears shed at all the close shaves where their nightmares all became waking realities.