2025 · ソースブック（プレイを拡張するルール／オプション）

Downcrawl 2nd Edition

A tabletop roleplaying toolkit for exploring the Deep, Deep Down, a strange underworld where cursed mazes, fungal settlements, curious creatures, and underground empires lie far below the surface. It works with any TTRPG system or as a standalone game using a lightweight, d6-based ruleset. Players create places, peoples, and encounters through prompts and tables, then undertake dangerous journeys between underworld realms. They gather information, manage supplies to avoid getting lost, face story-based encounters, and record discoveries on a communal map as passages shift. Rules support traditional GM-led play, GM-less sessions, and solo exploration, along with fungal foraging and optional character and world-building guidance.