(Myths of the Realm) What were the Twelve like in 1.0?

[Cleretic]

Then there was the Deity Stones scattered around Eorzea that each feature a mark of the Twelve which were first carved by Louisoix back then (as part of his plan to ultimately reseal Bahamut by summoning the Twelve's power), and which the player could get a ring of their chosen Guardian when they prayed at the relevant Deity Stone as part of the Seventh Umbral Era storyline.

For what it's worth, these deity stones are still around, and you visit almost all of them in the Ceremony of Eternal Bonding quest; Nald'thal had two, on in each Ul'Dah zone, but only one of them is accessible anymore. They were also where all the Scions were praying in the End of an Era cutscene, and of course, Moenbryda's funeral was at the stone of Thaliak.