The mountains of Æthiopia are a great place to put an adventure like Hammers of the God from Lamentations of the Flame Princess. If you use that particular adventure, I’d recommend adding some Mananubi corpses to the human corpses in the last battle. The dragon’s servants whispered jealousies into the willing ears of the denizens of the city, and accompanied the war party.
You’ll probably want to tailor the banes to whatever thing the player characters are carrying to the city. They’re at the end of the adventure; now’s probably not the time to add a completely new quest object. Something that they’re looking for should be in the temple. In this case, a good choice would be one of the tablets of Enki.
King Jeremiah is, instead, the Regent of the City.
The fire seeds were stolen from the Autumnal Swarm—or possibly from the dragon Tifá.
The lessons of the Dwarves are:
1. To make weapons thinking never to use them is hubris. Weapons will be used; treat them, and make them, with respect for their purpose.
2. To give rather than to teach is selfishness—and teaches selfishness among both those who receive and those who see gifts given.
3. Rewarding corruption leads to greater corruption.
Another great adventure for Highway 61, also from LotFP, is The Monolith from Beyond Space and Time. (It might also make a great random encounter anywhere on Highway 49). Anything to do with worms inside the Monolith becomes the Autumnal Swarm. Also, besides all of its other issues, the Monolith is another chance to give up the quest and leave the Road.