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Greenhouse of Nightmares [PLL-1]


The natural world is dying and Thymia Scarletscale has had enough. It's time to destroy civilization and pluck the humanoid parasites from the face of this world. And honestly, is she wrong? Will the players succeed in infiltrating Thymia's lair The Verdant Phronstistery and bring an end to her schemes? Or will Thymia & her team of yuan-ti research assistants create an army of monstrous insects to wipe humanoids from the face of the world?

Greenhouse of Nightmares is the first installment in Pretty Little Liches: a trilogy of adventures centered around three unique liches and their lairs designed for high-level play. These three lairs and the surrounding regions can be run independently as individual adventures or tied together into a mini-campaign that centers on the destruction of the Green Hand, an organization of dangerous liches.

A 3-5 hour Dungeons & Dragons 5th Edition adventure for Tier 4 (level 17-20) characters.

This adventure includes:

One-Page Setting Guide to a Deadly Swamp

12 Random Encounters for a Deadly Swamp

Path of Calamity, an Additional Mini-Adventure

Battle Tactics for a 3-Stage Boss Fight

A CR 26 Medusa Lich with New Legendary Actions

7 New Monsters

2 New Magic Items

If you are looking for a VTT map for this adventure, check out the spectacular Verdant Phrontistery map ( made by DM Hikaru on the Midgardia network. You can get even more VTT assets, RPG live plays, and art when you subscribe to their Patreon (!

I hope you enjoy this adventure; please rate & review!

Find me on Twitter @FantasyEcology


UNLOCKED! CopperOne-page setting guide to the Memorial Mire & 6 additional random encounters.

UNLOCKED! Silver - Path of Calamity, a mini-adventure that can be used as a prologue to Greenhouse of Nightmares.

UNLOCKED! Electrum - Update Pretty Little Liches: An Artifact & A Villain to expand the mini-campaign guide to Pretty Little Liches with 4 new single paragraph adventures.

GoldThe Green Hand Expanded: Background & Statistics for Rippinck the Deathless, a Bullywug Lich, and inspiration for incorporating him into your campaign.

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Reviews (4)
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April 30th, 2020
Tier 4 adventures are rare. Ones of this quality are even rarer! Loved the idea and the themes explored and dove right into the second installment! Can't wait for part 3 and hoping to get even a preview sooner rather than later! My only suggeste [...]
February 27th, 2020
The adventure is brutal and the story is intense. This leaves PCs enough to challenge even the most hardened veteran. The transitions are left open-ended, giving the players a chance to explore the space as much as possible. This is a great game for [...]
February 22nd, 2020
Ran this for my group over on our twitch channel (you can watch the VOD here!) and they had quite a lot of fun! I had to be a bit picky here and there due to some bug phobias, but I was able to keep the horrif [...]
December 17th, 2019
This adventure radiates pulp adventure horror so much you could almost whip it. Zeke told me a little about this adventure before he sent it to me to review, but I had no idea I would be diving into the literal morass and swamp that makes up Greenh [...]
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File Last Updated:
February 04, 2021
This title was added to our catalog on December 13, 2019.