The umbrella family for the three major revisions of Eon.
The three revisions/editions are both backwards and forwards compatible, so supplements and source books for one edition can be used with any of the rule editions. Some of the supplements went out of print and instead of being released as a reprint, was reworked.
In some cases, most notably "Alver: förbannelsens folk" was expanded into the much more extensive "Alver: Sångarens ätt".
In other cases it was split into several new supplements when expanded. One example of this is "Krigarens väg" that was replaced with "Riddaren", "Vapenmästaren" and "Krigsherren".
Another example is the bestiary "Monster & varelser" that is replaced by "Monster i Mundana" and "Bestialiska folk". The last part of the original "Monster & varelser" is missing from these two volumes and is supposed to be a part of the not yet (as of fall 2010) released "Husdjur och bruksdjur".