Clearly, the concept of "ancestors" is common knowledge in Hell.
Whether it is Sister Agatha, who has never ventured out to sea but only operates around the Great Monastery, or Calen, who has spent his whole life as a lighthouse cleaner, they are both well aware of this concept.
Moreover, Calen, due to his years of working at the lighthouse, seems to be very sensitive to this topic.
He shifted his body to also position himself near the window, pointing towards the intense beam of light projected by the lighthouse.
"The light cast by the Eye Demon King is not primarily for guiding ships; otherwise, any lighthouse could fulfill that function, and there would be no need for the Eye Demon King to donate an important eyeball.
The true purpose of the light is to observe the ancestors, to chart a course for sea-crossing vessels that avoids the ancestors.
