(Knowing nothing about Tianxia) why didn't you recognize when an opponent would require five times your party's strength to be defeated?
ok, the setting is Wuxia-China, kind of. With the kind of kung fu that that entails.. Think "Crouching Tiger, Hidden Dragon" but with even more supernatural stuff.
We had not seen the opponent fight earlier, and there was noone else who had either.
The opponent was a demon that had possessed the body of an ancient monk a couple of thousands of years ago. Appearance-wise, well yes he was in prime physical shape, but kind of looked human. He had like 1-2 weeks ago appeared near our town, and the demon had started eating the corpses of the dead. Something we disapproved of. So we tried setting a trap for him. That did not work well.. Appaerently the demon was drawn to the ancient temple that we had found, and started renovating, and he is unfortunately stuck there.
And well, he was not as tough as he had been, as I had taken away the magical weapon he carried earlier. We had kind of scared the demon away during the day earlier. And he had left some of his belongings behind. We were going to fight him during the night, which was a mistake...
The monk was doing whatever he could to keep the demon from going after the living (unless he got attacked). We had with us a demon-hunter (a npc), and she got killed and devoured to the bones in like 1 round before we had time to react.
Getting an army to go up against him would only lead to lots of corpses for him to eat. You need people with Chi-powers and awesome Kung Fu, and magical weapons.