Astera
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First, there was sound. Primal and Chaotic, it swirled around, until the first beings coalesced out of the sound, took shape and consciousness. There were 8 of them, each embodying a different aspect of sound. Some light and gentle, others harsh, some quick and frantic, others slow and methodical, some harmonious and others discordant. Naturally, not all of them got along, so they took it upon themselves to take parts of the Soundweave and sing it into form, give it shape. Thus Astera was born, a world sung into existence.
A campaign (initially) focused on the continent of Cualli, ruled by the Hegemony of Stars, a theocratic authoritarian state with a ruling class of Dragonborn, worshipping the 7 Great Harmonies. Out of this worship, corresponding Cults for each diety have formed, whose priests and spiritual agents push their respective agendas, forever in service of furthering the Great Plan given to them by the Harmonies, which were set down in golden plaques. These guiding texts, sometimes even prophetic in nature, serve as the foundation of the belief and justification for the rule of the Cults. Life within and especially without this society, with its heavy weight on prophecy, is one strong aspect of play.
Another is on the subject of maritime adventure, both above and below the waves, as the continent of Cualli does not stop at the shore. Plenty of pirate crews and bucaneers hunt across the oceans, and there are more wonders and forgotten civilisations to be found in the deep of the ocean.