Seylon's Tower

Updated Mar 9, 2026

Description

Hidden deep beneath Hogwarts, Seylon's Tower rises within a vast magical cavern. Carved from ancient, seamless stone and wrapped in creeping ivy, the tower stretches impossibly high into the darkness of a subterranean chasm. It gleams faintly under an enchanted night sky, complete with stars and a pale violet moon—an illusion conjured by long-forgotten magic.

The tower's architecture is both monolithic and arcane. Each circular floor is marked by ornamental bands and deeply set carvings that whisper of forgotten schools of magic. Cracks—glowing faintly with blue energy—zigzag across the surface, pulsing with unstable power. Moss grows up from the cavern floor, and faintly luminous mushrooms dot the surrounding glade.

Inside, the tower is sealed by ancient spells. No one enters without first overcoming arcane challenges designed not only to protect secrets, but to prove worth.

Background

The tower was built centuries ago by Seylon Vane, a wizard whose history has largely been lost to time. Little is known about him with certainty—most accounts are fragmentary and disputed.

Professor Wizzlethorpe revealed that adults who enter the tower see nothing but abandoned ruins, while children see its true contents—the enchanted laboratories, spectral guardians, and living experiments that Seylon left behind.

Key Locations

The Firefly Cellar

A forgotten cellar buried beneath the Restricted Section. The walls are choked with ivy and lined with ancient books long abandoned. In the center stands a lone, weathered door—no frame, no hinges, just a door standing upright. Around it, fireflies drift in slow spirals, casting soft golden light like living stars.

The Cavern

The tunnel beyond the door opens into a vast hidden cavern—so enormous it holds a false sky with shimmering stars and a violet moon frozen in place. At the center rises the impossible tower, its stone glowing faintly with pulsing blue light. The ground is carpeted with glowing mushrooms and tall grass swaying in a wind that doesn't blow.

True Background

Seylon Vane was a brilliant and ambitious wizard who served as a professor at Hogwarts in the early 1600s, renowned for both his teaching and his mastery of magical item creation. After the death of his daughter Lyra, he resigned from his post and secretly constructed the tower beneath the school, dedicating each floor to a different forbidden discipline in his desperate quest to reverse death itself—delving into alchemy, dragon magic, divination, and darker arts.

As his colleagues grew suspicious, Seylon placed one final enchantment on the tower: adults who entered would see only abandoned ruins, while children would see the tower's true contents. This was no accident—Seylon had been recruiting students to assist in his research and needed them to access his work while keeping the other professors blind to what was really inside.

When the Hogwarts faculty of the era eventually discovered the tower's existence, they found only crumbling walls and dusty relics. Unsettled by what Seylon had been doing, they sealed the entrance inside a magical cavern—now known as the Firefly Cellar—hidden deep beneath The Restricted Section. They also scrubbed Seylon's name from official records, wanting to bury the scandal. Over the centuries, the suppression worked almost too well: today, Seylon Vane is a footnote in obscure histories, and many of the facts about him are disputed. Most current professors know the tower exists but consider it little more than an ancient ruin and magical curiosity. Few believe the stories about his legendary relics, and no one is actively maintaining the cover-up—it simply became irrelevant long ago.

Full Tower Structure

The Tower is vertical, with circular floors
Each floor has a single staircase up and down
A solid stone wall blocks the staircase until the floor's challenge is completed (similar to Platform 9¾)

All Tower Levels

The Archmage Projection

Before his death, Seylon created a simulacrum of himself—a false Archmage—to carry on his work. The projection is unaware it's not real and remains trapped in endless, meaningless study.

DM Notes

The adults-see-ruins enchantment is key to why Wizzlethorpe needs the party—he can enter the tower, but sees only crumbling walls and meaningless debris
Bellatrix's Children are also seeking the tower's secrets
The portal in Seylon's Suite connects to Icespider Hollow in the frozen north
Higher floors contain increasingly dangerous challenges and darker magic
The final floors likely contain Seylon's ultimate creation—if it exists