I think a pyurgist could put flames out by absorbing the ferrum into their body, provided they quickly expended that energy again. They can't just keep
caith inside or they'd quickly succumb to whatever particular sickness.
I think solurgy's pretty much limited to healing, so I don't know if you could create a barrier spell necessarily, but you could cast a spell like Regeneration, where the target heals as quickly as he or she gets burned? Wouldn't be fun for Grady but I was thinking of having him ask for such a buffer before charging the pyurgist. I think Rei and Elara taking the pyurgist down makes more sense though.
One main thing for all urgists to remember is that the
caith has to come from somewhere. I think most urgists would carry a crystal on them that they could draw from - especially the more rare urgists like Vylmor. Crystals embedded in rings, necklaces, amulets, etc would be most common.
In a pinch if she didn't have any ferrum to use, Rei could at least start a fire to generate some ferrum and then use that to start more fires as the burning matter releases more free ferrum.
Elara
can draw stannum from the wind like during a storm or while the airship is flying, but say in a closed room or a listless day there's not much she can do without using a crystal.
Vee's pretty fucked for casting unless he either carries crystals, aidkits, or aurum-rich herbs / vials with him.
Caith that is infused into an artifice like a firearm's ferrum core, a sky engine's stannum cell, aidkit's aurum serum or alumail's alumen weave - can be absorbed by an urgist but much less efficiently than from a pure crystal, and cannot be simply returned afterward.
@XSilentWingsX as far as religions go, I'd say that each race could have multiple different faiths or schisms, but as a general rule:
Humans have a classical pantheon of gods and goddesses (from which the wandering stars get their names), and sacrifices of food and wealth to the gods keep you in their favor, or at least beneath their notice. In the modern era humans are more likely to simply adhere to the traditional festivals while offer lip service, without necessarily holding true belief.
Elfes have a religion based on surviving Lexon texts and temples. Most people of Allevent don't know much about the elfes' beliefs except that there is the Lightbringer and the Nightbringer, and the Nightbringer is said to have been what destroyed the Lexon civilization tens of thousands of years ago. Elfes don't have a concept of heaven or hell per se - apparently living for the betterment of the race will see you rewarded in your life by the Lightbringer, and sinfulness will see you harmed or killed by the Nightbringer.
Deor traditionally have an animist religion - Allevent is a living world full of spirits, everything is alive and contributes to the greater All.
Caith isn't worshipped exactly, but most deor people will personify the various
caith elements moreso than other races, holding
caith in reverence and trying to live in harmony with the natural cycles of Allevent.
The main gygr religion focuses on ancestor worship and a constant struggle with the natural world. Life on Allevent is a purgatory from which you can be released only if you have attained sufficient glory. Shaming your forefathers will see you live a long and meaningless life - bring your ancestors further glory and you will be rewarded with release from Allevent.
Bogles believe in only one god, which is neither benevolent nor malicious. Simply beyond mortal ken, their god is best described as
Capriciousness. You cannot ward it off with good works or pious living, nor will you attract its unwanted attention by living sinfully. Utterly unpredictable, their god may kill anyone at any time, for any reason. Some bogles therefore have an extremely fatalistic, pessimistic attitude, but most simply go about their lives striving to succeed in whatever endeavors, knowing there is nothing to be done by hand-wringing.