Empire of Satanis
A horror role-playing game¸ where the characters are fiends which live in a hellish universe called Yidathroth¸ or visit the human world (known to them as Sha-la). The content is offered free from www.cultofcthulhu.net¸ but there is also a print-on-demand version. There are fourteen races of fiends -- and all are unfathomably evil¸ and strive towards godhood through dark magics. It uses a dice-pool system¸ where resolution is by rolling attribute + skill d6s¸ and taking the highest -- where sixes are open-ended. Also¸ once each scene a player can roll 1d6¸ and if the result is a six¸ the player can declare a statement to be true in the game. - A description from https://darkshire.net/jhkim/rpg/encyclopedia/ with kind permission of John H. Kim