Black Blood Exchange
Black Blood [BB] is the blood of a vampire. Black Blood carries immense power within it, and thus is an extremely valuable commodity. A Black Blood Exchange, also called BBE, is when 2 vampires drink from each other to increase one another's strength by giving each other a boost in energy or rage.
A Black Blood Exchange can occur between 2 Vampires in the same clan, but only once every 24 hours. You have to be 20 years old and the age difference can not be more than a 30 year difference between you and your partner if either one of you is under 50 years old (example: if you are 33 and someone else is 95....it will not work.) Once your are over 50 years old then age is not a concern as long as both vampires are over 50 years old.
Only one vampire needs to perform the action but both will benefit. You perform the action by clicking the BBE button on a vampires page in the game.
Most vampires have partners they prefer to BBE with, but Black Blood exchanges can be stolen, so beware!