Concept design for an OSRS master quest.
Unraveling the mysteries of Mos Le’Harmless and the origins of the Black Mask.
The Cursed Mask is a fully written concept quest for Old School RuneScape (OSRS).
It’s a Master-level, long adventure that ties together existing lore from Morytania, Mos Le’Harmless, and the origins of the infamous Black Mask.
The story follows Brother Thaddeus, a timid monk from Entrana, sent on a “spiritual journey” that leads into a web of curses, pirates, and horrors of the deep.
| Attribute | Info |
|---|---|
| Difficulty | Master |
| Length | Long |
| Starting NPC | High Priest of Entrana |
| Main Locations | Entrana, Port Phasmatys, Mos Le’Harmless |
| Notable NPCs | Brother Thaddeus, Thalos the Deep, Dr. Salty B. Jones, Cavey Davey |
| New Monsters | Sea Horrors, Cave Terror (Boss) |
| New Rewards | Witchwood Howl Collector, Blackstone Claws, Tiny Terror pet |
“A pilgrimage meant to teach courage becomes a descent into madness.”
After a disastrous encounter in Port Phasmatys, Brother Thaddeus must face his fears as he uncovers a cursed cult’s experiments on the Jungle Horrors of Mos Le’Harmless.
With the help of pirates, monks, and an eccentric sea-slayer master, the player ventures deep beneath the island to battle the monstrous Cave Terror — a blackstone-twisted abomination.
Written & designed by: Popodroid
Quest concept & lore integration: Custom OSRS fan content (non-official)
This project is a fan-made concept for Old School RuneScape and is not affiliated with Jagex Ltd.
All RuneScape names, items, and trademarks are the property of Jagex.
You can read the full quest document on the GitHub Pages site.
🪙 Fan-made OSRS quest concept by Popodroid.