he mainly talks about the giant storm we see in the artwork, and how each of the 7 races (Korok, Goron, Shiekah, Zora, Gerudo, Rito, and Hylians) could have their own disaster/crisis that is caused by Ganondorf. The giant storm is likely over the Hebra region, and would be causing trouble to the Rito. The other 2 crisis we've seen so far are ones effecting the Gorons and the Koroks, with Death Mountain erupting in malice and the Deku Forest being totally missing. The number 7 is important because there are 7 tears surrounding the figure in the new trailer. The number 7 is commonly used in BotW, from references to the 7 sages and the 7 Heroines in Gerudo. However, Monster Maze also notes that the number 8 is important because of the secret 8th Heroine and the fact that Hyrule is separated into 8 regions. In this case, the Zonai could be the 8th race. In summary, each of the 7-8 races would have it's own disaster/crisis for Link to solve, and each of these events could involve a dungeon. Monster Maze thinks that the main purpose of the sky islands is to hold items or powers that help Link solve each crisis down below.