I never got the chance to mention this earlier but I beat infernum, including the boss rush. It took 3 months. I feel accomplished, that was extremely difficult.
This song was fun/hard to make, enjoy! I wrote a short listener's guide below.
Multiple references to other themes appear in this score, here's a list. 1 - 52: Calamitas 53 - 60: Cryogen 61 - 76: Crabulon 77 - 92: The Slime God 93 - 108: The Hive Mind 109 - 124: The Brimstone Elemental 125 - end: Calamitas