Just a couple of tables showing how sub-stellar objects are classified in the Ser worldline.

On the 'Terrestrial' planets, the 'Atmosphere' section merely shows the important gases, those that lifeforms really need. Inert 'filler' compounds aren't stated. Most known life is either carbon or nitrogen-phosphorus based and breathes either oxygen, hydrogen, carbon dioxide, nitrogen dioxide, methane, ammonia or sulfur.

Carbon-based life will breath O₂-CO₂, H₂-CH₄ or sulfur, while nitrogen-phosphorus life will breath O₂-NO₂, H₂-NH₃ or sulfur, depending on whether the metabolism is based off of oxygen, hydrogen or sulfur.

The first table makes no assumption on more general conditions, an Oceanic world can be in the middle of a 'Snowball Earth' scenario and it will still qualify. Those first five, the Terrestrial classes, are added in front of one of the other classes, for example, Terra is a Class AH (Though at times it was an AJ, when all the continents are unified).

And an ocean doesn't have to be water. It could be a water-hydrogen peroxide mixture, ammonia, methanol, hydrocarbon mixtures, formamide or liquid hydrogen.

The 'Unusual Biochemistry' prefix means that the lifeforms on the planet are, well, unusual: silicon-oxygen-based, arsenic-based, sulfur-based, halogen-derived biochemistry, et al.

Well, guys, tell me what you think. And any input for missing classes would be appreciated.