“ Fedolf, the notorious headsman of Iddland, is known as much for his beheadings as for his operatic arias of doom. A tower of power, standing nearly seven feet tall, and weighing in at almost four hundred pounds, Fedolf strikes fear in all onlookers, especially when he dons his executioner's hood, and goes shirtless, wielding his gigantic double-bladed pole-axe, on his way to the headsman's block. He possesses a beautiful singing voice, and will often send off his charges into the next life, while belting out baritone dirges and antiquated arias, usually involving death, destiny, and duty, in heavy doses.”
“ 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...”