Some require one participant (a gamemaster or narrator) to describe the setting and take supporting character roles, while others distribute this function among multiple players.
In this system, a referee decides the likeliness of the facts proposed by the players, and events happen or not according to a dice roll.
[14][15][16] In 1999, game designer Ian Millington's Ergo offered a collaborative role-playing system.
[19] Starting in the mid-00s, storytelling TTRPGs based upon historical events began to emerge in indie role-playing game design communities.
Examples include Grey Ranks (2007) by Jason Morningstar, which takes place during the 1944 Warsaw Uprising,[20] and Montsegur 1244 (2008) by Frederik Jensen, in which players tell a collaborative story about the Cathars.