“ 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...”
“ No undead provokes more sympathy than a Motherthing.
These are the frightening remains of mothers who lost a child to violence. These undead gather children that are encountered alone and "mother" them ". They fiercely protect their "children"”
“ In the Temple Square of The City, where the nine Greater Gods have their houses of worship, a sudden flash of light blinds (perhaps permanently) all those who are nearby. When the light has faded, a tiny, naked baby is lying in the doorway of each Temple. The Gods, it seems, have come into the world - but why?”