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This adventure was made to celebrate and promote the launch of our recent 5E Supplement & Campaign book; Sirensong!

A dark deep-sea descent into a daemonic war machine...

An ancient engine of destruction stirs beneath the waves. In the depths of the Glowing Trench, a faithful order’s mistake threatens to awaken a force not seen since the Daemonic Invasion. Will your party survive the living corridors of metal and flesh, or be consumed by the machine's pulse?

This is a one-shot adventure designed for a party of 3 to 5, level 5 characters. Chthonic Danger blends underwater dread, twisted dungeon crawl design, and escalating infernal tension. Players must brave the mechanical corpse of a daemonic titan before it fully awakens and unleashes destruction upon the world above.

Adventure Summary

When a Siren priestess unearths what she believes to be the Drowned God, she unknowingly awakens something far worse. Now, a colossal daemonic war machine stirs, growing stronger with each heartbeat. The party must enter its body, bypass corrupted guardians, and destroy the infernal heart before it fully reactivates.

This adventure can be adapted to your own campaign, played as a one-shot, or be part of the Starlight Chronicles setting that connects everything made by Kelfecil's Tales.

About this One-Shot Addon

Collaboration Organization & Design: Constantine "Kelfecil" Christakis
Author: Philip Alexandris

This package includes the following resources:

• x3 beautiful MAPS by Ori the Cartographer
• Awesome TOKENS by Dusky Cat

This adventure can be played at any level by adjusting the number of monsters in it as well as their behavior. It has been made with Roll20 in mind and can therefore run very smoothly on this Virtual TableTop.

Quick Guide

• System: D&D 5E
• Recommended Average Party Level (APL): 5
• General Theme: Dungeon Crawl, Daemonic Technology, Deep-Sea Horror
• Setting: Any, Starlight Chronicles, ocean-based campaigns
• Time - Sessions to Finish: x2 session (~6 hours)
• Installation: Add-On

We do not use AI text or images in any of our work. We stand vehemently against the use of AI in creative content.

Features

As a Kelfecil's Tales adventure, you can expect the following:

• ✍Signature Storytelling. We love to give background lore and narratives that connect all of our content. Expect well-explained NPCs and memorable stories. We also use our signature 3-act narrative method to ensure that you always open and close your sessions on time and with something interesting!
• 🎨Art inspires Storytelling. All of the published content by Kelfecil's Tales is made in collaboration with amazing illustrators, so you can always expect something gorgeous and inspiring to help you narrate your stories with even more ease!
• 🧭Perfect Maps for the Story. Being inspired by the maps to create the story itself, means that the maps perfectly fit for playing out the story with your group. Find beautiful maps by a different map maker in each of our releases!
• 💡Dynamic Lighting. Experience one of Roll20's most amazing features; dynamic lighting! All of our maps use this feature! Open doors and explore what hides in the shadows!
• 📖Patreon Lorebook. All of the adventures we publish are connected to the Starlight Chronicles setting which can easily be explored through the Interactive Maps and the online Lorebook features that Patrons get access to! Find out more here!

Add-On

Install this Add-On via the dropdown menu in the Game Addons section of the Game Details Page. Select Chthonic Danger and click on the blue Add to Game button beside the drop-down menu.

Bug and Technical Issue Reporting

If you encounter any bugs or technical issues with this adventure or any of Kelfecil's Tales' adventures on Roll20, visit our Bug Report Page and let us know (or send me a direct PM here on Roll20)!

Kelfecil's Tales

With my content, you can be sure you are always getting something "handmade" and authentic.

There are no big marketing agencies behind my projects, or YouTubers/Influencers to boost the metrics of my releases. My team and I rely on the genuine value, unique ideas and original concepts that our content brings in order to make our work known and to be able to continue doing what we love to do. Our aim is to create meaningful and memorable stories and narratives for you and your friends to enjoy.

If you would like to support what I do, then find out more here.

Thank you as always for your support in what I do and... May Starlight guide your way my friends!
~Kelfecil

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License: Roll20 End User License Agreement
(Personal Use Only, Do Not Distribute)