Mystaran Solar System
By Marco Dalmonte
The Mystaran Solar System, according to the Immortals Rules (1986 edition), updated with Spelljammer and Poor Wizard's Almanac information:
Name (real/mystaran) |
Size |
Shape |
Type |
Diameter (miles) |
Distance from primary (sun) in million of miles |
Notes |
| Sun (Ixion)¹ | H |
Spherical |
Fire |
864,000 |
- |
Surface temperature: 5,500°C |
| Mercury (Alphatia) | D |
Spherical |
Earth |
3,050 |
36 |
Will be created after Damocles' destruction |
| Venus (Valerias) | E |
Spherical |
Earth |
7,581 |
67 |
Extremely hot. Has a poisonous atmosphere and no water. |
| Earth (Mystara) | E |
Spherical |
Earth |
6,190 |
92 |
Hollow. Has 2 moons, one invisible from the surface of Mystara |
| Mars (Tarastia) | E |
Spherical |
Earth |
4,200 |
141 |
Barren. Has ice caps and may have underground rivers |
| Damocles (Asterius)² | E |
Flatworld |
Earth |
6,103 |
257 |
Will explode during or immediately after the Wrath of the Immortals and create Pluto and Mercury |
| Asteroid Belt (Tears of Asterius) | B |
Belt |
Earth |
Planetoids' diameter varies 10 to 430 miles |
300 (average) |
Will be created after Damocles' destruction and populated by space pirates |
| Jupiter (Vanya) | G |
Spherical |
Air |
88,670 |
483 |
Populated by faeries |
| Saturn (Khoronus) | G |
Spherical |
Air |
75,062 |
887 |
Has rings made of ice and earth shards |
| Uranus (Protius) | F |
Spherical |
Water |
29,577 |
1783 |
Has retrograde moons. Looks blue |
| Neptune (Hel) | F |
Flat |
Earth |
27,589 |
2794 |
One side dark, other white |
| Pluto (Alphaks) | D |
Irregular |
Earth |
1,400 |
3666 |
Will be created after Damocles' destruction |
| Charon (Thanatos) | E |
Cluster |
Water |
5,320 |
7105 |
Charon is made of frozen water masses clustered together |
Note 1: The core of the sun is formed by a large, hollow sphere, whose walls are pure black. Within it, a Fire Elemental Ruler (80 HD, 600 hp) rules over all the creature that can be found in the sun (which looks like the the Elemental Plane of Fire).
Note 2: Damocles is destined to explode after 1,000 AC. Its fragments form the Asteroid belt between "Jupiter" and "Mars", while the largest two pieces shoot off and become "Mercury" and "Pluto". Other pieces become the gas giants' retrograde moons. Damocles is a flatworld (semisphere) with a thriving civilization living on it. Neither Mystarans nor Damoclites know of each other, though.
Possible Scenario for Damocles' destruction (by Daniel Boese)
Damocles was somehow held together magically - perhaps its civilization was remnants of the mostly-unknown-on-Mystara "Earth" and "Water" groups from Old Alphatia. One day, the planet ran into a large sargasso (no-magic areas of Mystaraspace), which cancelled the magics holding the planet together, resulting in its utter destruction. If this is true, then the asteroid that crashed on Glantri and formed the Great Crater could have been a large chunk of Damocles, perhaps holding inside itself several new species of monsters and plants…