There were about a dozen Terrans who had been brought over to Ossen Town. They came in two batches, the first one—Maru's batch—was one of the first batches ever sold in Flaret Town back then.
They were treated no differently than other slaves, just more expensive and in exchange for more resources due to their elementalist status. Only the Lord could see this immediately.
Then, Maru made a name for himself and, eventually, people came to know that the newest Aliens were all elementalists!
This discovery was still a secret at the time, and Wugo's side immediately took action, buying another batch for a high cost.
By then, Maru had already shown off his skills and usefulness, which indirectly allowed the Terran slaves to live in relatively more decent conditions than other slaves.
He also had leadership skills and charm, making most Terrans present a united front. The slave owners also noticed that the terrans worked far more efficiently when Maru was there.
