Because more and more new people are asking what the groups are about, here is a brief summary.
The groups are a remnant of the 6th edition Vampire Counts army book, when the Bloodlines were distinct. Before the Blood Keep was overhauled, each group (the 5 Bloodlines plus the Necromancers) had it's own set of subforums (both public and group-only), but now they are gone. The groups remain only for sentimental reasons.
If you would like to join a group to manifest your affinity with a Bloodline or with the Necromancers, just ask any of the administrators, me included. You may do so in this thread, once one of the administrator notices your request, the post will be deleted, but you will be added to the relevant group. Currently this will just change the colour of your nickname to the colour appropriate for the group. Note, that you can only join one group, but switching between groups is possible.
I thank you for your time
Lord Gorthuar de Veris
Cult of Nagash