The Lost Island of Castanamir

Join me, as your Game Master for an Updated Lost Island of Castanamir

It is cold. You swam for your life to this mysterious island off the coast, losing most of your provisions in the process, only to find it barren of everything but grass. Waves keep crashing over it. A biting wind from the north drives through your already wet clothes, further chilling you to the bone. The night is falling and promises even colder temperatures; you wish this place had even a bush to burn as firewood. Your stomach has begun to complain about the lack of dinner when one of your companions calls. You rush to their side, hoping for the discovery of a way to turn grass into a sandwich. Instead, they point to the ground in front of you.

“Look, there.”

Set in a shallow depression in the ground is a weathered stone door. Carefully you step down and push. The door swings slowly open on creaking hinges, revealing a descending stair. The first thought that crosses your mind is whether it would be better to freeze to death up here in the elements or fall into the hands of Castanamir the Mad, Castanamir the unpredictable.

Come unlock the mystery of the Lost Island of Castanamir.


This adventure was originally for use with the ADVANCED DUNGEONS & DRAGONS® rules.

I have updated it for the Dungeons & Dragons 5th edition rule set and then adapted it for on-line play in Fantasy Grounds Unity.

It’s a strange old module, but I’ve always loved running it.

The Lost Island of Castanamir is a great jumping-off point for 3-5 5e Dungeons & Dragons characters starting between the first and fourth level. It’s good as either a standalone (2-4 session) adventure or as the start of a much longer campaign beyond that.

The Original Module

I first played through this adventure in the 1980s, after my Dungeon Master (the first I ever knew to get paid to run games) had converted it for play with Rune Quest.

I ran it on several occasions later, using AD&D, and it’s still a favorite of mine all these years later. I’ve spent some time, updating it for use with 5e, and creating maps for use on virtual tabletops with it on dungeon fog.

I was happy to see it available in PDF format at Dungeon Master’s guild. I think the reason I like it the most is that I like the idea of adding the Gingwatzim to my game.


Getting Started with Dungeons & Dragons

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