Heat Resistant Suit

"A long time ago, a powerful beast bathed a small town in flames. The flames were so strong that a party of warriors dispatched to deal with the beast could not even approach it, and just as the town was about to become fully consumed in the conflagration, a researcher of the mechanical arts gave the party's captain a special type of armor excavated from nearby ruins. After donning the armor, the captain was able to move through the flames safely and succeed in subjugating the beast."