Bucciarati managed to win in his battle against Secco, but his body was reaching its limit. The boss had already arrived in Rome and used Doppio to get closer to Bucciarati. Bucciarati’s condition worsens and he mistakes Doppio as Trish and Doppio plays along. The man with the secret to defeating the boss was waiting for them inside the Colosseum. Time then skips and the boss’s true identity is revealed.
There's some kind of 
power behind this glow!
!ثمّة قوّة ما وراء هذا التوهُّج
Irgendeine Kraft verbirgt
sich in diesem Glanz!
¡Un enorme poder suscita este brillo!
¡Un enorme poder suscita este brillo!
Cette lueur renferme un pouvoir !
Questo bagliore proviene
da un qualche tipo di potere!
Tem um poder intenso
por trás desse brilho!
В этом сиянии заключена сила!