tatah-thereafter at the end; kala-destruction; agni-fire; rudra-atma-in the form of Rudra; yat-whatever; srstam-created; idam-all these; atmanah-of His own; sam-completely; niyacchati-annihilates; tat kale-at the end of the millennium; ghana-anikam-bunches of clouds; iva-like that of; anilah-air.