Themas are, as name applies, themes contained within a type of Archive. For a practitioner, learning the entirety of the contents in an archive (which are seemingly endless in their contents) is not viable. That's why they pick a Thema related to an Archive and start specializing in that Thema.
A Thema describes one topic from the Archive Type.
For example, a Thema from Luxuria would be Desire related.
A practitioner might want to pick a Thema from Luxuria because they don't have many expectations or desire towards things going their way. From there, if they want to understand the desire for destroying everything, returning everything to nothingness, they may start researching that Thema, and become proficient in Lu commands that do exactly that - reduce all to nothing.
From Virtue Type they might pick Concordia because they don't experience conflict in life and are in harmony with who they are, a sense of fulfilment, perhaps. As for the Thema, they might pick something to do with keeping things in harmony, such as Lu that makes people act according to your will.
It is to note, that Themas of similar effect can occur in multiple Archives, but the difference is the application of the Thema. For example, a practitioner could learn to manipulate the emotions of people from both Superbia and Concordia. From Superbia they might've picked Imperium, which is about ruling and controlling. Whilst from Concordia one could pick Influentia, which they could use to rule and control.
A Thema is a single Lu command (with minor variations in execution) that achieves the effect of what its name implies. As such, a Thema is divided into spells of similar effect.
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