Warning boring D/M's Stuff
No
(and Class)
 Card
 Terrestrial
World Types

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I The Magician Utopian

TI
II The High Priestess Paradise

TII
III The Empress Terran

TIII
IV The Emperor Habitable

TIV
V The Heirophant Marginal

TV
VI The Lovers Barren

TVI
VII The Chariot Hostile

TVII
Extremes of Habitability
VIII Justice Climactic Carousel

CTVIII
IX The Hermit Placid

PTIX
X Wheel of Fortune Supra Tropical

TTX
XI Strength Hothouse

HTXI
XII The Hanged Man Supra Arctic

ATXII
XIII Death Arid Desert

DTXIII
XIV Temperance Oceania

OTXIV
Habitable Sports of Astrophysics
XV The Devil Backwards Planet

<>Txv
XVI The Tower Twin Worlds orbiting about a common centre, in turn orbiting around a primary. An extreme case of the Earth Moon system.
May be connected by a tenuous air corridor.

Txvi
XVII The Star Wedding Band World Tidally locked to the primary (typically M8 @ 0.15 A.U. to K5 @ 0.55 A.U.)
The Sunside central deserts become hot enough to melt lead. Darkside has an ocean of liquid oxygen. Around the middle The Twilight Zone: a thin band of habitability with seasons brought on by libration.

Txvii
XVIII The Moon Habitable Moon(s) of a Gas Giant (GG) or SuperPlanet (gg).

PIX
XIX The Sun Tectonic Inferno Super Volcanos, Earthquakes, Tsunamis, and other catastrophes. The central regions of the continental plates are the only safe place on the planet. Providing you aren't sitting on top of a Magma Plume!
XX Judgement Infinity World Planet in figure of eght orbit around two primaries. Major tectonic upheavals, seasonal breakdown and catastrophic climate variationwhen it changes tracks.
XXI The World Rogue Planet Habitable  world where it has no right to be! egs
  1. "OBA class rogue!"
  2. Habitable Moon(s)
  3. Summit
  4. Chasm
  5. Nova Nova
  6. Super Earth
O The FOOL More impossibilities!
  1. OBA class rogue star with multiple habitable planets (captured rogues) in far (far) orbits.
    of GG in a Main Sequence System suffering from Red Giant inflation.
  2. Habitable Moon(s) either around Giant Gas Giants (GG Class) or rocky super planets.
  3. Summit Hi Gee 'Hellhole' with habitable high mountain plateaux, surrounded by noxious cloud seas and oceans
  4. Chasm Low Gee 'HeavenHole' with habitable giant depression Crater, Crevasse, Chasm, Canyon,... in which a breathable planetary atmosphere has pooled surrounded by low pressure badlands and vacuum desert uplands.
  5. Nova Nova The Neutron star or Black hole has picked up a semi-stable planetary system:
    1.  in the first case the system will need a secondary sun and the world is optional (Gas Torus 'world')
    2. in the latter the illumination for photosynthesis and life processes may come from a constant infall of material into the BH.
  6. SuperEarth a giant world  2 -5 times Earth mass. Postulated to orbit Red Dwarfs proximal to an O- type UV stellar wind source.

R 'n R: World Generation: Habitable World Types
The Major Arcana provide 21 types of world easily colonised by humans and species with a compatible biochemistry. In reality only one world in a thousand potential T-type planets will actually be habitable. The following assumes that 'The Ancients' have been busy over the past MegaYear or so.
Each Planetarry type can be abbreviated and identified by the classification subscript.
 Utopian Proof that there is a Deity! Or a candidate as an alien terraforming experiment. Conditions are better than anything naturally possible. The Hidden Danger the planet is a 'Honey Trap' with all needs catered for; civilisation collapses into neo-edenic anarchy.

Paradise what Terra was like before Man ruined it! Biochemistry is sufficiently different so that toxic effects and alien diseases have no effect. Native lifeforms are easily supplanted by Terrestrial equivalents.

Terran Biochemistry sufficiently identical that diseases affect T-type organisms. And humans are a tasty treat for the larger carnivores. However plant and animal life is equally edible for terran import species.

Habitable Conditions and biochemistry are sufficiently difficult to provide a challenge. Low tech terraforming is required before crops will grow: soil sterilisation and seeding with T-Type biomass.

Marginal Greenhouses, Biocides and other Hi-Tech chemical and agricultural
processes are required before Earthlife can flourish in the soil.

Barren No viable Terrestrial biosphere. However the water is drinkable and the air can be breathed. All agriculture takes the form of hydroponic tanks and carniculture vats.

Hostile As Barren but food production needs constant supervision to avoid contamination or other disaster. Growing food on the Moon would be easier!

Climactic Carousel wild (eccentric ?) swings of climate as planet approaches the primary for a short summer and then swings away for a long winter. Depending on the location of the Golden Zone  (where water is wet) any one part of the year may be habitable (just) whereas the other parts of the year are too hot, cold, wet, dry, windy, whatever,... However the planet is Marginally habitable on 'average'. And at the right time of the year even Utopian!
The ultra competative native lifeforms tend to Aestivate during the Summer and Hibernate during the winter. In extreme cases two different adaptations may co-depend on each other or the entire biosphere may metamorphose between two forms.
And the same effect can be gained using a near circular orbit around  a variable primary or in a double star system.

Placid "SwampWorld" low orbital eccentricity; axis of rotation parallel to that of primary (no precession) No Moon. Low vulcanism. Thus no seasons, no weather extremes, no tides, no mountain building. no challenge, no progress. The world is mostly shallow ocean or swamp with an overabundance of  hostile flora and fauna; especially fungi, parasites, biting insects and swamp monsters.
 
Supra Tropical "Jungle World" Only habitable zone is at the poles and high mountainous plateaux. High latitudes are generally a tropical hell of jungle and swamp. An equatorial desert divides the two hemispheres.

Hothouse Biological Hellworld: Jungle; Swamp; Pelagic;... planet with an aggressive flora and fauna. Colonists generally go back to the trees!

Supra Arctic only a narrow band of habitability around equator. Atmosphere is only breathable because the CO2 freezes out at the poles!

Arid Desert planet with a struggling polar based civilisation. Now where have we heard of that one before? No not Dune but Mars!

Oceana a small continent, one or two large islands and lots of small archipelagos. Swimming skills are highly recommended.
Unusual and complex pelagic ecosystems 'floating forests' and 'weed plains'.
Backwards Planet Day is longer than the year! Planet is in process of becoming tidally locked. Generally in close orbit about a M8 @ 0.15 A.U. to K5 @ 0.55 A.U.