It is Airyaman that - together with fire - will "melt the metal in the hills and mountains, and it will be upon the earth like a river" (Bundahishn 34.18).
Aogemadaecha 41-47 prototypes death as a journey that has to be properly prepared for: As mortals acquires material goods as they go through life, so also should they furnish themselves with spiritual stores of righteousness.