Actually, the departure of the Ancient Saints didn't leave entirely without any contact.
In the Mist City, there is a very peculiar ancient device; using it allows one to hear echoes from the depths of the stars—a sound extremely old and obscure, no one knows whether it's a language or a communication device left by the Ancient Saints.
Once, the first generation of Demon Toads, led by Great Lord Crok, knew how to operate this thing. Unfortunately, during the Chaos Invasion, all first-generation Demon Toads died in battle. The remaining second-generation Demon Toads hadn't been passed down enough knowledge, which led them to know how to maintain the device but not how to use it.
Everything changed after the Emperor arrived in Itaza. The Master of Humans decoded the knowledge of the Ancient Saints. Though the knowledge was incomplete, he still utilized the Ancient Saints' technology to establish a stable communication channel with the Throne Hall.
