As it stands, we have the sun encompassing the elemental chaos with Sigil located above, a trade metropolis in the center of the solar system and just high enough above the orbital plane that you can sail directly to your destinations from there, never having to sail around a planet as their orbits will always take them below your path, not into it, until you reach your destination. In place of Mercury we have a “this space for rent” sign, and in place of Venus we have a slightly more poisonous version of Eberron, which is also home to Immoren, the setting of Iron Kingdoms (and by extension, WarmaHordes) Highpoint, the setting of MechDragon, and Kaladesh, the magepunk MtG plane. It’s a world recently hit by its own moon and which is almost entirely consumed by war, except for the continent of Khorvaire, which recently emerged from war and wants nothing to do with that any longer. Thus, naturally, people stopping over tend to come to Khorvaire. We’ve skipped over Terra for now, on account of that being hyper-valuable real estate that we’ll parcel out at the end, while giving Luna over to the Feywild for the light side and the Shadowfell for the dark side. Hyboria and the Young Kingdoms got their origin stories mushed together and deposited on Mars, and that was the end of the inner solar system. Today, we’re going to push further outwards to the gas giants and water worlds of the outer solar system.
First up, we have Jupiter. At some point, we’ll have to rename this to something other than just “Jupiter” and we can’t do that by stealing an existing setting name because Jupiter has no surface and is home to no settings. For now, we’re just going to keep calling it Jupiter. What we’re really here for are the moons: Ganymede, Callisto, Io, and Europa. All of them are bigger than Pluto and Ganymede is bigger than Mercury. We can add additional moons if necessary because, unlike the order of planets, the number of decently large moons Jupiter has is not super common knowledge (although nerdy types do fairly regularly know about these big four, both because Galileo discovered them and because they’re relatively good candidates for colonization in the next few centuries), but in this phase we’re just going to plonk down what settings we have onto the moons available and see how many are still homeless when we reach the end of the solar system.
Jupiter has two moons that are all at interesting and two more that are super boring. Ganymede is the moon with subsurface oceans (although it’s not the moon that might have marine life on it – that’s Saturn’s moon Titan), and Io is the moon that’s a volcanic hellscape. Callisto and Europa are basically just moons. Callisto does have some ice on it as well as a stupendous number of craters, and Europa technically has an extremely thin atmosphere of oxygen, but so far as providing interesting terrain goes, they are both basically just the moon in slightly different colors. This means we are throwing the details out completely. The only thing we are retaining from real science is that Jupiter has four moons (and even that is subject to change further down the line) and they range in size from “about the size of Asia” to “twice as big as Asia,” but bear in mind that Asia is by definition purely land (and small inland bodies of water), whereas any temperate D&D setting we seek to offload onto one of these moons will be at least 60% water, so in practice these moons go from “about the size of Asia” on Ganymede’s end to “about the size of Europe” on Europa’s (I doubt “this would have about the same landmass as Europe if it happened to have the same land:water ratio as Earth” was the reason for naming the moon Europa). Still enough room to locate a single-continent setting – or more than one, if they for some reason do not have oceans.
In addition to sheer space, there’s theming. A lot of our worlds have some overlap, and I don’t want Jupiter to be “the ghost planet” whose moons are all slight variations on gothic horror (i.e. Innistrad, Ravenloft, Diablo, etc. etc.). These moons form a community but are entirely different celestial bodies, so just like the terrestrial planets, I want each one to be noticeably different from the others. Unlike Hyboria and Eberron, where we stitched together settings with similar premises (swords and sorcery with ancient precursor people and magepunk, respectively), here on Jupiter we’re situating different settings near to one another to create little planetary neighborhoods with some decent variety to them. Since the gas giants of Jupiter, Saturn, and Uranus all have a significant number of sizable moons (though often they’re barely able to hold a single small continent once water is accounted for), each one can serve as a mini-solar system unto itself. Birthright and Greyhawk have a fair amount of overlap, but if Golarion is neighbors with Innistrad while Oerth is neighbors with Ravnica, that does a lot to help distinguish them.
Continue reading “D&D Solar System Syncretism III: Outer Planets” →