Ghost Lineages: The Advanced Players' Guide, for those familiar with the Savage Ages, is exactly what you'd expect. A whole 291 Pages long, the Savage Ages APG is a strong, in depth, and expansive on the Mammalian Fera, for mechanics, lore, the setting, and general focus of the Savage Age setting as a whole. Paul Way's art is beautiful as always, and adds a great deal of depth to an already beautifully illustrated setting. Expanding and expounding on the base setting for Werewolf's most esoteric age, the SA: APG provides much needed oceans of depth to the setting as a whole. Even in spite of the higher price tag, even for 26 USD this is a steal, as it is substantially larger than even 20 USD PDFs from White Wolf itself that are only half the size of this.

All in all, even if you just want more mechanics for the Fera, this is still highly recommendable.