We also have herbal medicine doctors. They remedies were... inefficient for this. It took us some times to realize that as well.

I am unsure if the people who first brewed the potion for this even had an antidote themselves. They were so bent on revenge, it probably didn't matter to them if they lost people in the doing of it.

Our doctors can heal most common ailments. But the Ophiuchus people were blessed by their constellation and their power has no equal. They could even bring the dead back to life. Not as undead. They brought them back as if they had never been dead.