This is Usefulness of Pyris Enchantment for humans.
The Pyris Enchantment can be gained two (technically three) ways:
Eating a Monster If your teeth and jaws or stomach and stomach acid are what kills a monster, its magic will go to your body, because a monster's Enchantment goes to what killed it. However, a Torchblow is the size of an adult pig, and they breathe fire, so they can't exactly be swallowed whole. Even if their shell is removed, their gelatinous insides are flaming hot and there's a lot of them, so you'd have to cool them off before you could even attempt to choke one down, and you'd have to swallow fast to avoid suffocation.
Killing a Monster Yourself There are two ways to do this: use a weapon that incorporates part of your body (like a spear tipped with your own bone, or a club studded with your teeth, even a bone steel weapon made with the ashes of your own teeth, bone, or nails) or using your own body as the weapon. The thing is, while one can karate chop wooden boards in half, I'm not sure how effective a human can be in killing a Torchblow with their natural weaponry alone.
Someone who kills one Torchblow alone gains the Ember title, becoming fireproof (and smokeproof, they can breathe fire's gaseous byproducts without harm) and becoming a natural heat generator, their body, breath, and even sweat imbued with the cozy warmth of a small campfire. They can also glow, and this glow is as bright as the typical medieval torch.
Someone who kills twelve Torchblow, however, becomes a Blazer (and in the process, Pyris is maxed out). Blazers can generate and manipulate a bonfire's worth of heat or flame, even storing the heat they generate or absorb and either releasing it or converting it (into kinetic force) later. A Blazer can also release a bonfire's worth of heat or light from their body, even controlling the level of heat or light they generate so they are comfortably warm to the touch or to focus light into a beam capable of cooking an ant or starting a fire (think magnifying glass, not modern laser). They can even utilize heat and light to create a shimmering effect around them, making it difficult to hit them with ranged attacks.
As stated before, they can also absorb flame and heat, adding it to their natural energy to increase their mechanical output. In other words, if a Blazer has absorbed a bonfire's worth of energy, they can convert that into kinetic force, store that in their arm, and then punch you with that added force, all without hurting themselves. This should allow them enhanced strength and speed, as long as they can fuel it, and that requires concentration.
However, both Embers and Blazers have weaknesses. Water weakens them (the only exception being hot water). Warm water renders an Ember lukewarm and halves the power of a Blazer, while cold water (regular cold, we're not talking sub-Arctic temperatures here) all but extinguishes an Ember and reduces a Blazer to 1/4th their natural might. By "water", I mean liquid water that covers half or more of a Pyris-holder's body or condensed humidity (ie. fog) around an individual.
Additionally, the less oxygen an Ember or Blazer has, the less firepower they can unleash. Being short on breath halves their power while being oxygen-deprived (like being on the top of Everest or after a long dive or being choked by something, etc.) quarters their power. The reverse is also true; the more oxygen an Ember or Blazer has, the more power they have.
So, all that out of the way, my question is How Beneficial Would The Pyris Enchantment Be For Humans?
Specifications For Best Answer:
The best answer will include the potential uses of both an Ember's natural warmth and a Blazer's literal firepower (ie. potential, possibly additional, employment options for holders of the Pyris Enchantment, such as colonizing cold areas and firefighting). This will also include ways they can help their community (we're talking medieval European village, noble's manor, or castle here).
The best answer will also include potential uses of a Blazer's ability to functionally enhance their speed or strength by absorbing heat or flame ('fire energy') and converting it to kinetic force, as well as their ability to generate and focus light. The first allows them to run faster, jump higher, hit harder, and so forth and they can only absorb and therefore harness a bonfire's worth of (heat) energy. The second allows them to start fires, blind people, and make it harder to hit them, as stated before, but I am interested in other applications one could find when one can generate and manipulate a bonfire's worth of light.
Finally, the best answer will analyze and sum up how beneficial the Pyris enchantment would be for those holding it (and why), whether they be an Ember or a Blazer.