When you think of it, there have been a total of 14 Umbral/ Astral Era (7 of each) cycles, already.

With the exception of the 7th Umbral Era, each represented an Element. We're also currently in the 7th Astral Era. It makes me wonder if the Asciens intended awaken Zodiark in 7th Umbral era, but that plan was foiled by the WoL -- a singularity that's not part of their plan.