Demon Slayer's Infinity Castle Arc is one of the most action-packed anime arcs of all time. Related Demon Slayer: 7 Things to Expect in Infinity Castle Part 2 Demon Slayer: Infinity Castle Part 1 was a hit, but now, fans are looking forward to the next movie, Infinity Castle Part 2. In Muzan Kibutsuji's expanding fortress, the strongest duos from the Infinity Castle Arc of Demon Slayer execute the deadliest combinations of skill, teamwork, and raw power during the ultimate battle. 2 Gyomei and Muichiro Formed Demon Slayer's Strongest Hashira DuoClose UfotableMuichiro Tokito wielding a sword in demon slayer image via ufotableGyomei and Muichiro spent much of the Infinity Castle Arc fighting alongside one another. 1 Muzan Used Nakime to Stay One Step AheadClose demon slayer strongest muzan kibutsuji formsdemon slayer muzan attacked Image via UfotableNakime has her huge eye exposed.