The Guilds of Ravnica are ten sociopolitical factions that have held power throughout the cityscape since its founding. Each guild has its own distinct ideology and cultures that unifies its members with one another, with the guild itself, with its functions and purposes, and with its structure. Each guild has a Parun, which is the founder of a guild and first Guildmaster. Besides the leadership, each guild also features its own Guildmages and Champions. Collectively, the Guilds of Ravnica have ruled the plane for 10,000 years, since the signing of the ancient and magically potent Guildpact; a binding spell, document, and contract, that details the specific role and responsibilities of each of these guilds. The various roles that each guild plays in maintaining the Guildpact aren't always as cut and dry as the Senate and the Legion's are. For instance, House Dimir's duty is to constantly subvert the efforts of the Guildpact and the other guilds in order to make it stronger.