One RPG

A unified ruleset you can play at the table or on Steam. Fast, flexible, and fun. One system, endless adventures.

Read the System Try the Intro Adventure

Why One RPG?

Learn once, play anywhere

Same core mechanics for tabletop and digital play. Solo, duo, or party.

GM-friendly

Clear encounter math, quick NPC tools, and session prep that doesn’t eat your week.

Open-friendly

SRD-style docs and a creator kit for third‑party content.

First module: Depths of Serathis

A plunge into a cursed sinkhole-city where living stone remembers every footstep.

Preview the Module