October 17–19, 2025

Hofraithe Rosenthal
Hessen, Germany
(~ 1.5h from Frankfurt a. M.)

Registrations opening soon

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Welcome!

The project group ESA of the non-profit association for the promotion of fantastic culture Nexus e. V. invites you to Cauldron 2025 – the OSR Euro Con! From October 17th to 19th we will meet at Hofraithe Park Rosenthal, near Frankfurt am Main, for a weekend full of games, socializing and exchange.

What You Can Expect

A weekend full of old-school game rounds by and with authors of the DIY scene
Hearty regional catering as well as grilled sausages, suckling pig and more
Auction & author booth
Prizes for best DMs and best players
ADDKON-compatible rounds
Chainmail tabletop battles

Our Mission

Cauldron is all about old-school roleplaying – or to be precise: about the first edition of AD&D (Advanced Dungeons & Dragons, the successor and predecessor of D&D). This includes the various clones, replicas and adaptations.

This means that characters can be transferred and used across different game rounds.

AD&D allows for a wide range of play styles and adventures, all of which we would like to experience at the con. We are therefore especially looking forward to your registration as game masters! Whether you bring your own world, self-made dungeons and adventures, or a classic module you’ve always wanted to DM – everything is welcome!

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