This article analyses 'To the Hellfire', a popular song by deathcore band Lorna Shore, which was very popular when it was released in 2021 due to its extremity and perceived heaviness. The article examines what makes this song so heavy, looking at its composition and production. It draws on interviews and a mix walkthrough by the song's producer, Josh Schroeder. The findings suggest that the song’s heaviness is mainly provided as a result of sonic weight, harmonic distortion, hyperreal performances, disruption and unpredictability, contrast and dynamic development towards a climax. Musically, blending metal subgenres to increase heaviness is deemed beneficial, and concerning production, automated and dynamic processing responsive to musical structures and performances is highlighted.