FVLMINATA - Armed with Lightning
An RPG set in an alternate history where the Romans discovered gunpowder. It is set in AD 248. The divergence point is in AD 79 when Aufidius Caelus and Pliny the Younger survive the eruption of Pompeii by visiting the Misenum shore¸ and Caelus then devotes his life to pursuing the secret of volcanic power. It uses an original system which includes a magic system based on Roman superstition. - A description from https://darkshire.net/jhkim/rpg/encyclopedia/ with kind permission of John H. Kim