After emerging from the portal into the foyer, Ophelia immediately searches for a blank wall because she intends to summon the mysterious final door herself instead of waiting for Phantasma to finish normally. Sinclair tries to stop her and insists that only Salemaestrus can make the door appear when one contestant remains, but Blackwell confirms that Ophelia has done it before. Using her memory of the door and the power in her locket, Ophelia successfully brings it into existence, which shocks Sinclair and proves she can bypass the expected order of the game.

When Ophelia cannot open the door, Blackwell explains that the lock requires the creator’s name. He says he could not tell her before because he was unable to speak that name unless she already knew it, but now the door should still respond. Sinclair warns Ophelia that she does not understand what she is doing, yet Ophelia ignores him and focuses on Blackwell instead.

Before entering, Ophelia asks Blackwell to promise that they will find each other again after she passes through the door alone. Blackwell swears that crossing the threshold will not be the last time he sees her. Trusting that vow, Ophelia speaks the name “Salemaestrus,” unlocks the door, and steps into the darkness beyond, where a violent gust separates her from Blackwell and the manor.

Inside the dark space, Ophelia calls for Salemaestrus and demands her prize, but no one answers. After a long silence, she decides to summon Blackwell, partly because she lacks the usual clue for the level and partly because she needs guidance. Power surges through the void, Blackwell appears in the circle of light, and Ophelia immediately senses that something is different. He then reveals the truth: his full name is Salemaestrus Erasmus Blackwell, and he is the Prince of the Devils.