Imagine a sentient tower that can trawl through your memories, allowing you to relive those fights in a new, purpose-built combat arena. Imagine a tower that can give you challenges based around those unlocked bosses, giving you arcade-style bonuses and weaknesses as you progress to the top. Imagine a tower that can reward you for completing those challenges with unique gear, allowing you to show off your progress and flaunt your success in the battered faces of your enemies. Have fiendish fun!