Technology Through the Ages - A supplement where it showcases various different time-periods (most likely in the PoL world since that is the base) where technology has advanced. Each chapter would explore a different level of technology in terms of; items (weapons, items, armour, etc.), feats, PPs, etc. how it affects societies and races, etc.
Lets say there is 3 chapters:
-Enlightenment: This would cover the time period of early gunpowder weapons, Da Vinci type contraptions, etc. Hopefully have say a example city similar to Venice.
-Age of Sails: This would be an excuse mainly to bring in lots of pirates and swashbuckling. But it would give us more advance firearms, ships and perhaps we could have say... A fantasy Napoleon (this is sorta a wish to see Temeraire stuff in D&D).
-Industrial Might: Much more advance firearms such as revolvers, gatling guns, repeating rifles, etc. It would showcase industrialism, and could be our Steampunk chapter. With lots of airships, steam powered devices, ironclads, etc.