Beneath Castle Bergfried lies the vault of the grief-struck Baron – heavily infested with a crystalline virus from the past. Here an adventure party must choose between rival forces that seek to explore the vault and decide the future of the Inside World. ‘Vault of the Mad Baron’ is the second installment in a series of three modules in the Inner World. It can be played as a stand-alone adventure or be added as a small barony to an ongoing campaign. The scenario can be used with Swords & Wizardry or any other early variant of game rules and is suitable for PCs level 2-5. Inside you will find: A 60+ page old-school module with a layout optimized for fast and easy interfacing. An adaptable barony complete with town, castle and dungeon. Unique districts with encounters and sights. 6 major factions fully detailed with headquarter, plans, and missions for the PCs. Detailed description of a castle and associated dungeon levels. Downloadable maps for both players and the Referee. Locations allowing the PCs to travel to another era within the setting. Unique new creatures and magic items.