“ A fragment of letter drifts down to the street. You catch it, and unfold the charred edges.
'...know I will always lov..
..at never dies. It is th...
..f my passion that b...
...nd it cannot be ext..
....n heaven or....n hel..
....ill be by you...ide an...
......
...... yours foreve.........
... Mendates ........
...................................'
Looking up from the fragmented text you glance around at the rooftops. There. A minute snowfall of scraps of letters is cascading from the chimney of a half-timbered house nearby.”
“ 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...”