A group's total number of advancements in relation to the average number of advancements of all groups determines their era. Advancements represent technological and educational level. Each group starts with 1 advancement when they are created. When a new piece is created its era is determined by the era of the outfitted group that created it.

Era	Abbreviation	Percentage Range of Average Group Advancements	Maximum Completion of Piece	Active Skills Per Character For Family Group In Era
Futuristic	FS	1000% and higher	100%	7
Contemporary	CY	667% thru 999%	90%	6
Modern	MO	334% thru 666%	75%	5
Industrial	IR	1% thru 333%	55%	4
Exploratory	EX	Average thru -33%	35%	3
Ancient	AI	-34% thru -66%	20%	2
Primitive	PV	-67% and lower	10%	1