Vulcan

If Vesta is the fire that generates life, Vulcan embodies the fire that destroys: the violence of the natural force that seethes in volcanoes. In Achaia he's identified with Hephaestus, the divine smith. The strength of Vulcan's fire is so wild that the ancient haruspices forbade the first Roman Kings to build a temple dedicated to this god inside the city limits. It was therefore erected at the foot of the Quirinal Hill , where the city had not expanded yet. The nourishment of the people depends on the benevolence of this god. During harvest time, at teh end of the summer when the heat is at its strongest, the breakout of a fire in the fields would carry disaster and hunger. For this reason, the most solemn celebrations of Vulcan are performed in August, to beg the god to protect the crops.
The god is also worshipped as a divine artisan. Harnessing the terrible power of fire, he can produce wonderful works, such as Jupiter's bolts, Mars' weapons, or the stars affixed to the celestial vault. He's portrayed with a beard, the short dress of artisans, and his sledgehammer in hand.

There are astronomers in Asia and Mesopotamia that believe that the stars, rather than fixed fires on a celestial dome, are themselves fires burning independently in an endless void. Even were this true, they would still be creations of Vulcan!
-Merius