In Smells Like Stream Spirit, the characters will encounter some naiads. There are two families of naiads in the area who are generally hostile towards each other, but the hostility has not turned into outright war - yet. Naturally, a couple, one from each group, has fallen in love with other. Depending on how the characters interact with the naiads, they may incite a conflict - possibly by accident - or cause the two sides to reconcile.
This is aimed at d100 systems but is generic enough in nature to be adapted to others.
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