R’lyeh Rising #4: At the Mountains of Madness — A 5e Lovecraftian Horror Adventure

by Dungeon Matters

A Deadly 5e Adventure of Cosmic Horror & Madness.

Survive the frozen wastes, uncover ancient ruins, and escape the Shoggoth in this 5e horror adventure set in the 1930s.

The Terror Awakens Beneath the Ice

• Play time: 4–6 hours
• Level 4
• For 2–6 players
• Rule System: 5e Compatible

The Story

In 1931, a Miskatonic University expedition uncovered impossible fossils and alien ruins beneath the Antarctic ice before vanishing without a trace. Now, your party must brave the frozen plateau, rescue the survivors, and confront horrors older than humankind. In the depths of a sunken citadel, the ancient Elder Things stir, while a massive Shoggoth hunts in the darkness. Can your players escape the citadel of Earth’s first masters, or will they be consumed by the thing that should not be?

What’s Inside

• 41 pages of Cthulhu Mythos-inspired 5e horror
• 5 detailed maps of camps, mountains, and subterranean horrors
• 12 original monsters including the Proto-Shoggoths, Elder Things, and the Shoggoth
• Unique rules for Antarctic exposure
• Survival-driven design: Players must use stealth, ingenuity, and sacrifice

Part of the R’lyeh Rising Adventure Series

R’lyeh Rising is a collection of ten Lovecraftian 5e adventures inspired by H.P. Lovecraft’s pulp horror. Each adventure stands alone, or can be played in sequence as a chilling campaign of eldritch dread.

“Your players will be hooked from the frozen runway all the way to the final desperate escape.”

R’lyeh Rising #4: At the Mountains of Madness — A 5e Lovecraftian Horror Adventure is available through DriveThruRPG in PDF.

---

Please note:  The links in the post above are “affiliate links”. This means if you click on the link and purchase the item the author of this post will receive an affiliate commission.