The Anathergians are an immortal race. They arrived on Earth nearly five thousand years ago after their planet was destroyed. They have sworn to protect all humans, even those bent on destroying them.
Anathergians look much like humans, but they are incredibly strong and nearly impossible to kill.
You can find out more about each of the Anathergian stories at these links:
The Anathergians Trilogy
The Anathergian Novellas