A hunting party realizes a druid has been foiling it’s hunting efforts and shifts it’s focus from hunting wild game to hunting the druid.
Sinister, enganging plot involves a powerful tool fallen into the wrong hands. Only the players can set things right. They have a piece of the tool, but first they have to figure out how the tool works, why two opposing forces are persuing them, whom to trust, and what to do next. Murder, accusation, betrayal, diplomacy, combat, and constant mystique force the players to make incredibly difficult decisions.
With a huge number of sacrificial victims, another realm long ago secretly bound a Prince of the land spirits, Iorstonn by name, thus ensuring the fertility, and improving the magical defences, of their realm. But binding that Prince to one spot has disrupted the weather and magical patterns (ley lines?) over half the continent. Things have become bad enough that a coalition has been formed to rectify the situation, once divinations have established the cause.
Your party is one of the teams assembled to do the rectification: find the binding object and steal it ("so that we can destroy it here in our realm, of course"...*) or destroy it over there. Presumably the Prince will be grateful to his rescuers and angry at the binders, but with a greater spirit like Iorstonn one can never be sure: such beings are "tricksy".
* Of course, the rulers of our realm might want to control Iorstonn for their own ends...