I've mentioned before, but maybe a talisman/tattoo of the symbol for hades, like a memento from serving in the underworlds army. Originally I thought of the symbol for Pluto but that was a more roman thing and might be a bit out of alignment. So possibly a white poplar tree or pomegranate instead?
A lot of Greek coins had pomegranates now that I'm looking http://www.wildwinds.com/coins/greece/pamphylia/side/