This is an irregular feature - both in frequency and oddness - dedicated to a word I came across that I have never previously used.
Hephaestian adj. of or related to Hephaestus, the Greek god of fire and iron-working.
This word is generally used in describing the work of blacksmiths. The alternate adjectival form of "Hephaestic" is also found in most dictionaries.
Also worth noting: Prometheus stole the fire he gave to man from the forge of Hephaestus, and Hephaestus is also credited with creating the evil gift that the gods gave man: Pandora and her box.