Providence RPG
An unusual fantasy RPG¸ ""a mix of fantasy and the four-color bravado of super-heroes"". It has a separate rules book with the mechanics and a world book describing the setting. It is set on a former penal colony planet in another dimension¸ which was cut off from the original world and freed by a revolt. Much later¸ a crack in the world started to flood the world¸ forcing the inhabitants to look for the long-lost gates to escape. The system uses attribute+skill as modifiers to a 2d10 roll vs difficulty. - A description from https://darkshire.net/jhkim/rpg/encyclopedia/ with kind permission of John H. Kim"