If the chilling rituals and the sense of forbidden sorcery in Black Easter captivated you, you'll be enthralled by The Great God Pan. Machen's novella is a classic of supernatural horror, delving into secret experiments that open doors best left closed. The unsettling consequences of meddling with dark forces echo the same sense of dread and awe you found in James Blish's work.

If you appreciated the ambiguous morality of Blish’s characters—especially the sorcerer Theron Ware—then The Book of the New Sun will keep you riveted. Severian, an apprentice torturer, is both sympathetic and unsettling, and his journey is filled with ethically fraught decisions and shifting loyalties that will keep you questioning everyone’s true motives.

If you enjoyed the relentless pursuit and high stakes of unleashing (or stopping) evil forces in Black Easter, you’ll love The Devil Rides Out. Wheatley’s novel follows the Duc de Richleau and his friends as they race to save an innocent soul from sinister cultists, combining demonic rituals, occult lore, and a pulse-pounding sense of urgency.

If the philosophical undertones and existential questions woven into the fabric of Black Easter appealed to you, The Magus will fascinate you. Fowles crafts a profound exploration of reality, free will, and the supernatural, all through the lens of mysterious rituals and mind games on a remote Greek island.

If the meticulously crafted occult systems and the vivid sense of place in Black Easter drew you in, A Darker Shade of Magic offers an equally immersive experience. Schwab’s world is layered with magical rules, parallel Londons, and complex power struggles, all rendered with atmospheric detail and a sense of genuine peril.