Well I did notice a curious lack of anything to do with water or the ocean in the domains and portfolios, but Jvan is already kind of a sea-god by physical location and Zephyrion is (was?) sort of the storm god. And the djinn tackle pretty much everything related to the elements or nature. Murmur even tackles sound.

Maybe I could have done something with a djinni character but Vitrum is basically the exact same thing as the character I would be making.

It's so hard to think of an original (and useful idea that would give me something to contribute and write about for a while) domain/portfolio that I've actually been considering just writing from a mortal perspective. Seems like all the good concepts for demigods are taken.