Book Simon is a final boss in Cry of Fear. Considered the "true" final boss of the game, he is faced if you killed Carcass and trusted Doctor Purnell with the gun in the Asylum. Defeating him will unlock the 4th ending (arguably the "good" ending).

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You returned back to him after escaping and called him father(BASED ON BTD FAN GAME)

Her Infernal Majestrix, Queen Abrogail Thrune of the Thrice-Damned House of Thrune is the sixth ruler to wear the crown of diabolical Cheliax since her great-grandmother Abrogail Thrune I took control of the warring noble houses in 4640 AR. As a young monarch, she receives advice from her pit fiend courtier, Gorthoklek, who also served her great-grandmother. Asmodeus himself provided an erinys named Contessa Lrilatha to serve as the young queen's instructor. Her Infernal Majestrix, Queen Abrogail Thrune, with Contessa Lrilatha and General Gorthoklek, her most trusted advisers. Beautiful and ruthless, in addition to being a powerful sorceress, Abrogail makes a strong leader for Cheliax. Abrogail appears as an immature, demanding, and spoilt ruler, but she has nevertheless proven herself to be a vicious fighter on the political scene. Whispers say that her fiendish advisers rein in her darker impulses. What is certain is that her quick wit and daring schemes can only help Cheliax regain some of its lost imperial glory in the years to come.