The first I know of, the Lambs of Dalamud, were active for around five years before I learned of them - often holding sacrifices to create creatures from beyond the Void. I doubt they can be studied well.
The second I can think of, however, had begun as a legitimate organization to unite Eorzea (which is made of three four main city-states) to combat the threat of the Garlean Empire. Until they learned of the power of Primals, and slipped into the role of holding Crystal sacrifices. The things I would look for is:
- Groups of people wearing similar insignia, even if they do not have full uniforms. - Areas which seem to be either oddly abandoned or oddly popular for their location. - We cannot assume we are the only ones to be summoned. If we can witness a summoning, we may be able to learn more about how to track them.
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The second I can think of, however, had begun as a legitimate organization to unite Eorzea (which is made of
threefour main city-states) to combat the threat of the Garlean Empire. Until they learned of the power of Primals, and slipped into the role of holding Crystal sacrifices. The things I would look for is:- Groups of people wearing similar insignia, even if they do not have full uniforms.
- Areas which seem to be either oddly abandoned or oddly popular for their location.
- We cannot assume we are the only ones to be summoned. If we can witness a summoning, we may be able to learn more about how to track them.