Without Nangong Wuyue's reminder, Hao Ren would have missed out this important fact
This was not to say that Hao Ren knew nothing about Norse mythology. In fact, he knew that in the original version, Ymir and Yggdrasil were actually related, but ever since he got to know the actual characters in the myths, he began to forget the myths themselves — the giant of wisdom, Ymir had become a Guardian of the Plane of Dreams; Yggdrasil was now a First Born; Loki's daughter, Hela, Goddess of Death, was but a solitary and gloomy lady. Little by little, reality replaced the myths he had learned…
Hao Ren immediately contacted Ymir, who was keeping watch of Athens Sanctuary.