They were the first to hear of Merlin's theories, and all his viewpoints were castles in the air, just like the theories of the Old Gods and the "world's edge".
"You must have seen his manuscripts."
Until the end of his life, Merlin held firm to the belief that the Old Gods guarded the edge of the world. As long as they could break through that final boundary, consciousness could awaken in the world outside the "box." "But he probably didn't document his failures there, did he? Before coming to this plane, he had failed seven times, each time bringing irreversible disaster to the plane he was on, causing tsunamis that flooded entire continents or witnessing civilizations perish in erupting volcanoes... These were the 'heroic deeds' Merlin once accomplished."
