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)

H

Spherical

Fire

864,000

-

Surface temperature: 5,500C

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)

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…

 

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