The Dutch depressives in Celestial Season lit up the nascent death/doom scene of the early ’90s with the underground classics Forever Scarlet Passion and Solar Lovers. They went dormant in 2001 after a mid-career flirtation with a more streamlined stoner doom sound, but in 2020, they released The Secret Teachings. The album was a glorious return to the funereal Romanticism of the band’s earliest work, and its follow-up doubles down on that sound. Mysterium I is the first in a planned trilogy of albums set for release over the next two years. It walks in the path of early My Dying Bride and Anathema, replete with baroque strings, moaned vocals, and cobwebbed atmosphere.