CIV 6 announced an expansion. Amongst a list of features that seems to have be stolen from EU IV too (coalition, for instance), they have one that is fairly intriguing.
Summarized, both ''golden ages'' and ''dark ages'', with the idea that the apex would be to survive to a dark age, and rise from the ashes figuratively speaking.
IE, in EUIV terms, a golden age could only be triggered by surviving a crisis, a major reform or a taking head-on a coalition or a word power (instead of checking boxes on a list...)
Summarized, both ''golden ages'' and ''dark ages'', with the idea that the apex would be to survive to a dark age, and rise from the ashes figuratively speaking.
IE, in EUIV terms, a golden age could only be triggered by surviving a crisis, a major reform or a taking head-on a coalition or a word power (instead of checking boxes on a list...)