Ernst holds the title of Guardian of Steel within the Sacred Beast Cosmos, embodying the principle of ingenuity. His primary function involves performing administrative duties in support of the Queen and the other nine Guardians. He actively participates in operations concerning the identification of the Legendary Etoile. This includes briefing the Guardians upon the arrival of candidate ships to the Holy Land. Ernst's responsibilities also encompass coordinating the efforts among the Guardians throughout the candidate selection process for the Etoile role.