Like many ecological planets in the Plane of Dreams, Tannagost was born due to the sowing of the Seed of Origin. The First Born was buried in the depths of the planet, and the Tannaeans were the second batch of life from the Seed of Origin.
What happened on that planet of Holletta (the people in Becky's hometown had not named their planet yet, so Hao Ren could only temporarily refer to it as Holletta) also happened on this planet: the First Born woke up frantically and attacked the Second Borns mercilessly. Unlike those on the planet of Holletta, the Tannaeans had significantly worse luck: the First Born they faced was not controlled by any security device. The planet's biosphere was reshaped, and the Tannaeans who had created a glorious civilization were killed.
"Even here…" Lily already had a phobia of the First Born. She had goosebumps the moment she saw the huge tentacles. "I feel the hairs on my tail standing up!"