Instead of "Secret boss", it should just be called "Throne%, as the floor 12 bosses aren't really secret. Since the speedrun timer pauses after you kill a floor 12 boss, it would just be a more understandable and fitting name for the category.

Additionally, I propose Pain%, where you play as cinder 16 deprived with no mastery upgrades, where the run ends when you beat floor 12. Basically, a speedrun for the hardest way to play normally