The fact this magic merchant knows about bacteria and inner infections... then medicine in this world is certantly close to our modern world
Well, Germ Theory actually can be traced back to as early as 1025 AD, and some elements and ideas of it actually can trace back to 400 BC or even earlier.
So if in this world, those ideas were more universally accepted, it's pretty reasonable honestly.
gangrene irl means say goodbye to that tissue or die. only literal magic can help here
*Pant...**Pant...*For now, I'll prepare a simple oral medication with fever reducing and anti-bacterial properties. I infused it with the native elderberries and starflower, and added in mana quartz ground to a fine powder.
The taste is truly unpleasant to drink, so I masked it with rock salt and honey before pouring it into her mouth.*Steady sleep breathing...**Clench...*As night fell, the elven girl developed a high fever.
Fatigue was certainly a part of it, but there was a high probability that it was also caused by inflammation in the scars all over her body, as well as infection running rampant in her internal organs.
At this point, there may be no other choice but to amputate her limbs...For awhile, her breathing was shallow and mixed with delirious mumbling, but as the medicine began to take effect, she passed into peaceful sleep. While watching over her carefully and mulling her medical treatment, night gave way to dawn.